diff --git a/api/api/.jvm/src/main/scala/aqua/api/Test.scala b/api/api/.jvm/src/main/scala/aqua/api/Test.scala
index f587abaac..d81c00412 100644
--- a/api/api/.jvm/src/main/scala/aqua/api/Test.scala
+++ b/api/api/.jvm/src/main/scala/aqua/api/Test.scala
@@ -6,7 +6,6 @@ import aqua.compiler.AquaCompiled
 import aqua.files.FileModuleId
 
 import cats.data.Chain
-import cats.data.Validated.{Invalid, Valid}
 import cats.effect.{IO, IOApp}
 import fs2.io.file.{Files, Path}
 import fs2.{Stream, text}
@@ -14,14 +13,16 @@ import fs2.{Stream, text}
 object Test extends IOApp.Simple {
 
   override def run: IO[Unit] = {
+
     APICompilation
       .compilePath(
         "./aqua-src/antithesis.aqua",
         Imports.fromMap(Map("/" -> Map("" -> List("./aqua")))),
         AquaAPIConfig(targetType = TypeScriptType),
         TypeScriptBackend(false, "IFluenceClient$$")
-      )
-      .flatMap { res =>
+      ).timed
+      .flatMap { case (duration, res) =>
+        println("Compilation time: " + duration.toMillis)
         val (warnings, result) = res.value.run
 
         IO.delay {
diff --git a/aqua-src/antithesis.aqua b/aqua-src/antithesis.aqua
index 37dd102b3..446f57b99 100644
--- a/aqua-src/antithesis.aqua
+++ b/aqua-src/antithesis.aqua
@@ -1,40 +1,33 @@
 aqua M
 
-export bugLng317
+export returnSrvAsAbility
 
-service MyOp("op"):
-  identity(s: string) -> string
+ability MyAb:
+    call() -> string
 
-ability WorkerJob:
-  runOnSingleWorker(w: string) -> []string
+service MySrv("default-id"):
+    call() -> string
 
-func runJob(j: -> []string) -> []string:
-  <- j()
+func mySrvDefault() -> MyAb:
+    <- MySrv
 
-func disjoint_run{WorkerJob}() -> -> []string:
-  run = func () -> []string:
-      r <- WorkerJob.runOnSingleWorker("a")
-      <- r
-  <- run
+func mySrvResolved() -> MyAb:
+    MySrv "resolved-id"
+    <- MySrv
 
-func empty() -> string:
-  a = "empty"
-  <- a
+func mySrvThird() -> MyAb:
+    MySrv "third-id"
+    <- MySrv
 
-func bugLng317() -> []string:
+func useMyAb{MyAb}() -> string:
+    <- MyAb.call()
 
-   res: *string
-
-   outer = () -> string:
-     <- empty()
-
-   clos = () -> -> []string:
-     job2 = () -> []string:
-       res <- outer()
-       res <- MyOp.identity("identity")
-       <- res
-     <- job2
-   worker_job = WorkerJob(runOnSingleWorker = clos())
-   subnet_job <- disjoint_run{worker_job}()
-   finalRes <- runJob(subnet_job)
-   <- finalRes
+func returnSrvAsAbility() -> []string:
+    result: *string
+    MySrvDefault <- mySrvDefault()
+    MySrvResolved <- mySrvResolved()
+    MySrvThird <- mySrvThird()
+    result <- useMyAb{MySrvDefault}()
+    result <- useMyAb{MySrvResolved}()
+    result <- useMyAb{MySrvThird}()
+    <- result
\ No newline at end of file
diff --git a/backend/air/src/main/scala/aqua/backend/air/Air.scala b/backend/air/src/main/scala/aqua/backend/air/Air.scala
index 56a7bf226..b619b29a6 100644
--- a/backend/air/src/main/scala/aqua/backend/air/Air.scala
+++ b/backend/air/src/main/scala/aqua/backend/air/Air.scala
@@ -120,42 +120,77 @@ object Air {
 
   case class Comment(comment: String, air: Air) extends Air(Keyword.NA)
 
-  private def show(depth: Int, air: Air): String = {
-    def showNext(a: Air) = show(depth + 1, a)
+  private def showInternal(space: String, sb: StringBuilder, air: Air): Unit = {
 
-    val space = " " * depth
+    def showNext(a: Air): Unit = showInternal(space + " ", sb, a)
 
     air match {
       case Air.Comment(c, a) =>
-        space + "; " + c.replace("\n", "\n" + space + "; ") + "\n" +
-          show(depth, a)
+        sb.append(space)
+          .append("; ")
+          .append(c.replace("\n", "\n" + space + "; "))
+          .append("\n")
+
+        showInternal(space, sb, a)
+
       case _ =>
-        s"$space(${air.keyword.value}" +
-          (air match {
-            case Air.Null ⇒ ""
-            case Air.Never ⇒ ""
-            case Air.Next(label) ⇒ s" $label"
-            case Air.New(item, inst) ⇒ s" ${item.show}\n${showNext(inst)}$space"
-            case Air.Fold(iter, label, inst, lastInst) ⇒
-              val l = show(depth + 1, lastInst)
-              s" ${iter.show} $label\n${showNext(inst)}$l$space"
-            case Air.Match(left, right, inst) ⇒
-              s" ${left.show} ${right.show}\n${showNext(inst)}$space"
-            case Air.Mismatch(left, right, inst) ⇒
-              s" ${left.show} ${right.show}\n${showNext(inst)}$space"
-            case Air.Par(l, r) ⇒ s"\n${showNext(l)}${showNext(r)}$space"
-            case Air.Seq(l, r) ⇒ s"\n${showNext(l)}${showNext(r)}$space"
-            case Air.Xor(l, r) ⇒ s"\n${showNext(l)}${showNext(r)}$space"
-            case Air.Call(triplet, args, res) ⇒
-              s" ${triplet.show} [${args.map(_.show).mkString(" ")}]${res.fold("")(" " + _)}"
-            case Air.Ap(operand, result) ⇒ s" ${operand.show} $result"
-            case Air.ApStreamMap(key, operand, result) ⇒ s" (${key.show} ${operand.show}) $result"
-            case Air.Fail(operand) => s" ${operand.show}"
-            case Air.Canon(operand, peerId, result) ⇒ s" ${peerId.show} ${operand.show}  $result"
-            case Air.Comment(_, _) => ";; Should not be displayed"
-          }) + ")\n"
+        sb.append(s"$space(${air.keyword.value}")
+        (air match {
+          case Air.Null ⇒
+          case Air.Never ⇒
+          case Air.Next(label) ⇒ sb.append(s" $label")
+          case Air.New(item, inst) ⇒
+            sb.append(s" ${item.show}\n")
+            showNext(inst)
+            sb.append(space)
+          case Air.Fold(iter, label, inst, lastInst) ⇒
+            sb.append(" ").append(s" ${iter.show} $label\n")
+            showNext(inst)
+            showNext(lastInst)
+            sb.append(space)
+          case Air.Match(left, right, inst) ⇒
+            sb.append(s" ${left.show} ${right.show}\n")
+            showNext(inst)
+            sb.append(space)
+          case Air.Mismatch(left, right, inst) ⇒
+            sb.append(s" ${left.show} ${right.show}\n")
+            showNext(inst)
+            sb.append(space)
+          case Air.Par(l, r) ⇒
+            sb.append("\n")
+            showNext(l)
+            showNext(r)
+            sb.append(space)
+          case Air.Seq(l, r) ⇒
+            sb.append("\n")
+            showNext(l)
+            showNext(r)
+            sb.append(space)
+          case Air.Xor(l, r) ⇒
+            sb.append("\n")
+            showNext(l)
+            showNext(r)
+            sb.append(space)
+          case Air.Call(triplet, args, res) ⇒
+            sb.append(s" ${triplet.show} [${args.map(_.show).mkString(" ")}]${res.fold("")(" " + _)}")
+          case Air.Ap(operand, result) ⇒
+            sb.append(s" ${operand.show} $result")
+          case Air.ApStreamMap(key, operand, result) ⇒
+            sb.append(s" (${key.show} ${operand.show}) $result")
+          case Air.Fail(operand) => sb.append(s" ${operand.show}")
+          case Air.Canon(operand, peerId, result) ⇒
+            sb.append(s" ${peerId.show} ${operand.show}  $result")
+          case Air.Comment(_, _) => ";; Should not be displayed"
+        })
+        sb.append(")\n")
     }
+  }
 
+  private def show(depth: Int, air: Air): String = {
+    val sb = StringBuilder()
+    val space = " " * depth
+    showInternal(space, sb, air)
+    sb.result()
   }
 
   implicit val s: Show[Air] = Show.show(show(0, _))
diff --git a/build.sbt b/build.sbt
index b6e07cb0a..61167dba6 100644
--- a/build.sbt
+++ b/build.sbt
@@ -188,7 +188,7 @@ lazy val inline = crossProject(JVMPlatform, JSPlatform)
   .crossType(CrossType.Pure)
   .in(file("model/inline"))
   .settings(commons)
-  .dependsOn(raw, model)
+  .dependsOn(raw, model, mangler)
 
 lazy val transform = crossProject(JVMPlatform, JSPlatform)
   .withoutSuffixFor(JVMPlatform)
@@ -207,7 +207,7 @@ lazy val semantics = crossProject(JVMPlatform, JSPlatform)
       "dev.optics" %%% "monocle-macro" % monocleV
     )
   )
-  .dependsOn(raw, parser, errors)
+  .dependsOn(raw, parser, errors, mangler)
 
 lazy val compiler = crossProject(JVMPlatform, JSPlatform)
   .withoutSuffixFor(JVMPlatform)
@@ -253,6 +253,17 @@ lazy val logging = crossProject(JVMPlatform, JSPlatform)
     )
   )
 
+lazy val mangler = crossProject(JVMPlatform, JSPlatform)
+  .withoutSuffixFor(JVMPlatform)
+  .crossType(CrossType.Pure)
+  .in(file("utils/mangler"))
+  .settings(commons)
+  .settings(
+    libraryDependencies ++= Seq(
+      "org.typelevel" %%% "cats-core" % catsV
+    )
+  )
+
 lazy val constants = crossProject(JVMPlatform, JSPlatform)
   .withoutSuffixFor(JVMPlatform)
   .crossType(CrossType.Pure)
diff --git a/compiler/src/main/scala/aqua/compiler/AquaCompiler.scala b/compiler/src/main/scala/aqua/compiler/AquaCompiler.scala
index 66b7c7446..94643ff83 100644
--- a/compiler/src/main/scala/aqua/compiler/AquaCompiler.scala
+++ b/compiler/src/main/scala/aqua/compiler/AquaCompiler.scala
@@ -1,30 +1,19 @@
 package aqua.compiler
 
-import aqua.backend.Backend
 import aqua.compiler.AquaError.{ParserError as AquaParserError, *}
 import aqua.linker.{AquaModule, Linker, Modules}
-import aqua.model.AquaContext
-import aqua.parser.lift.{LiftParser, Span}
 import aqua.parser.{Ast, ParserError}
-import aqua.raw.RawPart.Parts
-import aqua.raw.{RawContext, RawPart}
-import aqua.res.AquaRes
-import aqua.semantics.header.{HeaderHandler, HeaderSem, Picker}
-import aqua.semantics.{CompilerState, Semantics}
-import aqua.semantics.{SemanticError, SemanticWarning}
+import aqua.semantics.header.{HeaderHandler, Picker}
+import aqua.semantics.{SemanticError, Semantics}
 
 import cats.arrow.FunctionK
 import cats.data.*
-import cats.data.Validated.{Invalid, Valid, validNec}
-import cats.parse.Parser0
 import cats.syntax.applicative.*
 import cats.syntax.either.*
 import cats.syntax.flatMap.*
 import cats.syntax.functor.*
-import cats.syntax.monoid.*
-import cats.syntax.semigroup.*
 import cats.syntax.traverse.*
-import cats.{Comonad, Functor, Monad, Monoid, Order, ~>}
+import cats.{Comonad, Monad, Monoid, Order, ~>}
 import scribe.Logging
 
 class AquaCompiler[F[_]: Monad, E, I: Order, S[_]: Comonad, C: Monoid: Picker](
diff --git a/compiler/src/main/scala/aqua/compiler/CompilerAPI.scala b/compiler/src/main/scala/aqua/compiler/CompilerAPI.scala
index 722c59a23..c665aafb5 100644
--- a/compiler/src/main/scala/aqua/compiler/CompilerAPI.scala
+++ b/compiler/src/main/scala/aqua/compiler/CompilerAPI.scala
@@ -1,33 +1,22 @@
 package aqua.compiler
 
+import aqua.backend.Backend
 import aqua.compiler.AquaError.*
-import aqua.backend.{AirFunction, Backend}
-import aqua.linker.{AquaModule, Linker, Modules}
 import aqua.model.AquaContext
-import aqua.parser.lift.{LiftParser, Span}
 import aqua.parser.{Ast, ParserError}
-import aqua.raw.RawPart.Parts
-import aqua.raw.{RawContext, RawPart}
-import aqua.res.AquaRes
+import aqua.raw.RawContext
+import aqua.semantics.RawSemantics
 import aqua.semantics.header.{HeaderHandler, HeaderSem}
-import aqua.semantics.{CompilerState, RawSemantics, Semantics}
 
 import cats.data.*
-import cats.data.Validated.{invalid, validNec, Invalid, Valid}
-import cats.parse.Parser0
 import cats.syntax.applicative.*
+import cats.syntax.either.*
 import cats.syntax.flatMap.*
-import cats.syntax.foldable.*
 import cats.syntax.functor.*
-import cats.syntax.monoid.*
-import cats.syntax.semigroup.*
 import cats.syntax.traverse.*
-import cats.syntax.either.*
-import cats.{~>, Comonad, Monad, Monoid, Order}
+import cats.{Comonad, Monad, Monoid, Order}
 import scribe.Logging
 
-import scala.collection.MapView
-
 object CompilerAPI extends Logging {
 
   private def toAquaProcessed[I: Order, E, S[_]: Comonad](
diff --git a/model/inline/src/main/scala/aqua/model/inline/state/InliningState.scala b/model/inline/src/main/scala/aqua/model/inline/state/InliningState.scala
index e7c452476..e931cd0aa 100644
--- a/model/inline/src/main/scala/aqua/model/inline/state/InliningState.scala
+++ b/model/inline/src/main/scala/aqua/model/inline/state/InliningState.scala
@@ -1,5 +1,6 @@
 package aqua.model.inline.state
 
+import aqua.mangler.ManglerState
 import aqua.model.{FuncArrow, ValueModel}
 import aqua.model.inline.state.{Arrows, Counter, Exports, Mangler}
 import aqua.raw.arrow.FuncRaw
@@ -23,7 +24,7 @@ import scribe.Logging
  *   for [[Counter]]
  */
 case class InliningState(
-  noNames: Set[String] = Set.empty,
+  noNames: ManglerState = ManglerState(),
   resolvedExports: Map[String, ValueModel] = Map.empty,
   resolvedArrows: Map[String, FuncArrow] = Map.empty,
   instructionCounter: Int = 0
@@ -35,7 +36,7 @@ object InliningState {
     Counter.Simple.transformS(_.instructionCounter, (acc, i) => acc.copy(instructionCounter = i))
 
   given Mangler[InliningState] =
-    Mangler.Simple.transformS(_.noNames, (acc, nn) => acc.copy(noNames = nn))
+    Mangler[ManglerState].transformS(_.noNames, (acc, nn) => acc.copy(noNames = nn))
 
   given Arrows[InliningState] =
     Arrows.Simple.transformS(_.resolvedArrows, (acc, aa) => acc.copy(resolvedArrows = aa))
diff --git a/model/inline/src/main/scala/aqua/model/inline/state/Mangler.scala b/model/inline/src/main/scala/aqua/model/inline/state/Mangler.scala
index 15a73edb2..3e3b4c86c 100644
--- a/model/inline/src/main/scala/aqua/model/inline/state/Mangler.scala
+++ b/model/inline/src/main/scala/aqua/model/inline/state/Mangler.scala
@@ -1,65 +1,36 @@
 package aqua.model.inline.state
 
 import cats.data.State
+import aqua.mangler.ManglerState
 
 trait Mangler[S] {
   self =>
-  def getForbiddenNames: State[S, Set[String]]
-
-  def findNewNames(introduce: Set[String]): State[S, Map[String, String]]
-
-  def findNewName(introduce: String): State[S, String] =
-    findNewNames(Set(introduce)).map(_.getOrElse(introduce, introduce))
-
   def findAndForbidName(introduce: String): State[S, String] =
-    for {
-      n <- findNewName(introduce)
-      _ <- forbid(Set(n))
-    } yield n
+    findAndForbidNames(Set(introduce)).map(_.getOrElse(introduce, introduce))
 
-  def findAndForbidNames(introduce: Set[String]): State[S, Map[String, String]] =
-    for {
-      n <- findNewNames(introduce)
-      _ <- forbid(introduce ++ n.values.toSet)
-    } yield n
+  def findAndForbidNames(introduce: Set[String]): State[S, Map[String, String]]
 
   def forbid(names: Set[String]): State[S, Unit]
 
-  def forbidName(name: String): State[S, Unit] =
-    forbid(Set(name))
-
   def transformS[R](f: R => S, g: (R, S) => R): Mangler[R] =
     new Mangler[R] {
 
-      val getForbiddenNames: State[R, Set[String]] =
-        self.getForbiddenNames.transformS(f, g)
-
-      def findNewNames(introduce: Set[String]): State[R, Map[String, String]] =
-        self.findNewNames(introduce).transformS(f, g)
-
       def forbid(names: Set[String]): State[R, Unit] =
         self.forbid(names).transformS(f, g)
+
+      def findAndForbidNames(introduce: Set[String]): State[R, Map[String, String]] =
+        self.findAndForbidNames(introduce).transformS(f, g)
     }
 }
 
 object Mangler {
-  def apply[S](implicit mangler: Mangler[S]): Mangler[S] = mangler
-
-  implicit object Simple extends Mangler[Set[String]] {
-    val getForbiddenNames: State[Set[String], Set[String]] = State.get
+  def apply[S](using mangler: Mangler[S]): Mangler[S] = mangler
 
-    def findNewNames(introduce: Set[String]): State[Set[String], Map[String, String]] =
-      getForbiddenNames.map(forbidden =>
-        (forbidden intersect introduce).foldLeft(Map.empty[String, String]) { case (acc, name) =>
-          acc + (name -> LazyList
-            .from(0)
-            .map(name + "-" + _)
-            .dropWhile(n => forbidden(n) || introduce(n) || acc.contains(n))
-            .head)
-        }
-      )
+  given Mangler[ManglerState] with {
+    def findAndForbidNames(introduce: Set[String]): State[ManglerState, Map[String, String]] =
+      State.apply(_.findNewNames(introduce))
 
-    def forbid(names: Set[String]): State[Set[String], Unit] =
-      State.modify(_ ++ names)
+    def forbid(names: Set[String]): State[ManglerState, Unit] =
+      State.modify(st => st.forbid(names))
   }
 }
diff --git a/model/inline/src/test/scala/aqua/model/inline/ManglerSpec.scala b/model/inline/src/test/scala/aqua/model/inline/ManglerSpec.scala
new file mode 100644
index 000000000..df17745f7
--- /dev/null
+++ b/model/inline/src/test/scala/aqua/model/inline/ManglerSpec.scala
@@ -0,0 +1,80 @@
+package aqua.model.inline
+
+import aqua.mangler.ManglerState
+import aqua.model.inline.state.Mangler
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class ManglerSpec extends AnyFlatSpec with Matchers {
+
+  "mangler" should "rename right" in {
+    val mangler = Mangler[ManglerState]
+
+    val results = for {
+      res <- mangler.findAndForbidNames(Set("first", "second"))
+    } yield res
+
+    val res = results.runA(ManglerState()).value
+    res shouldBe Map()
+  }
+
+  "mangler" should "rename right if already have renamed" in {
+    val mangler = Mangler[ManglerState]
+
+    val results = for {
+      res1 <- mangler.findAndForbidNames(Set("first", "first-0", "first-1"))
+      res2 <- mangler.findAndForbidNames(Set("first"))
+      res3 <- mangler.findAndForbidNames(Set("first-0"))
+      res4 <- mangler.findAndForbidNames(Set("first-1"))
+      res5 <- mangler.findAndForbidNames(Set("first-2"))
+    } yield (res1, res2, res3, res4, res5)
+
+    val (r1, r2, r3, r4, r5) = results.runA(ManglerState()).value
+    r1 shouldBe Map()
+    r2 shouldBe Map("first" -> "first-2")
+    r3 shouldBe Map("first-0" -> "first-0-0")
+    r4 shouldBe Map("first-1" -> "first-1-0")
+    r5 shouldBe Map("first-2" -> "first-2-0")
+  }
+
+  "mangler" should "rename multiple times right" in {
+    val mangler = Mangler[ManglerState]
+
+    val results = for {
+      res <- mangler.findAndForbidNames(Set("first", "second"))
+      res2 <- mangler.findAndForbidNames(Set("first", "second"))
+      res3 <- mangler.findAndForbidNames(Set("first"))
+      res4 <- mangler.findAndForbidNames(Set("first", "second"))
+      res5 <- mangler.findAndForbidNames(Set("second"))
+    } yield (res, res2, res3, res4, res5)
+
+    val (r1, r2, r3, r4, r5) = results.runA(ManglerState()).value
+    r1 shouldBe Map()
+    r2 shouldBe Map("first" -> "first-0", "second" -> "second-0")
+    r3 shouldBe Map("first" -> "first-1")
+    r4 shouldBe Map("first" -> "first-2", "second" -> "second-1")
+    r5 shouldBe Map("second" -> "second-2")
+  }
+
+  "mangler" should "forbid and rename right" in {
+    val mangler = Mangler[ManglerState]
+
+    val results = for {
+      _ <- mangler.forbid(Set("first", "second"))
+      res1 <- mangler.findAndForbidNames(Set("first", "second"))
+      res2 <- mangler.findAndForbidNames(Set("first"))
+      _ <- mangler.forbid(Set("first"))
+      _ <- mangler.forbid(Set("first", "second"))
+      _ <- mangler.forbid(Set("second"))
+      res3 <- mangler.findAndForbidNames(Set("second"))
+      res4 <- mangler.findAndForbidNames(Set("second", "first"))
+    } yield (res1, res2, res3, res4)
+
+    val (r1, r2, r3, r4) = results.runA(ManglerState()).value
+    r1 shouldBe Map("first" -> "first-0", "second" -> "second-0")
+    r2 shouldBe Map("first" -> "first-1")
+    r3 shouldBe Map("second" -> "second-1")
+    r4 shouldBe Map("first" -> "first-2", "second" -> "second-2")
+  }
+
+}
diff --git a/model/inline/src/test/scala/aqua/model/inline/RawValueInlinerSpec.scala b/model/inline/src/test/scala/aqua/model/inline/RawValueInlinerSpec.scala
index 8248986ea..e7a25680d 100644
--- a/model/inline/src/test/scala/aqua/model/inline/RawValueInlinerSpec.scala
+++ b/model/inline/src/test/scala/aqua/model/inline/RawValueInlinerSpec.scala
@@ -1,28 +1,28 @@
 package aqua.model.inline
 
-import aqua.model.inline.raw.{ApplyPropertiesRawInliner, StreamGateInliner}
+import aqua.mangler.ManglerState
 import aqua.model.*
+import aqua.model.inline.raw.StreamGateInliner
 import aqua.model.inline.state.InliningState
-import aqua.raw.value.{ApplyPropertyRaw, FunctorRaw, IntoIndexRaw, LiteralRaw, VarRaw}
-import aqua.types.*
 import aqua.raw.value.*
-
+import aqua.types.*
 import cats.Eval
-import cats.data.NonEmptyMap
-import cats.data.Chain
-import cats.syntax.show.*
-import cats.syntax.foldable.*
+import cats.data.{Chain, NonEmptyMap}
 import cats.free.Cofree
-import scala.collection.immutable.SortedMap
-import scala.math
+import cats.syntax.foldable.*
+import org.scalatest.Inside
 import org.scalatest.flatspec.AnyFlatSpec
 import org.scalatest.matchers.should.Matchers
-import org.scalatest.Inside
+
+import scala.collection.immutable.SortedMap
+import scala.math
 
 class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
 
   import RawValueInliner.valueToModel
 
+  def toMangler(noNames: Set[String]) = ManglerState(noNames.map(_ -> 0).toMap)
+
   def join(stream: VarModel, size: ValueModel) =
     stream match {
       case VarModel(
@@ -188,7 +188,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
   "raw value inliner" should "desugarize a single non-recursive raw value" in {
     // x[y]
     valueToModel[InliningState](`raw x[y]`)
-      .runA(InliningState(noNames = Set("x", "y")))
+      .runA(InliningState(noNames = toMangler(Set("x", "y"))))
       .value shouldBe (
       VarModel(
         "x",
@@ -200,7 +200,6 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
 
   // TODO: unignore and fix after stream restrictions will be implemented
   ignore /*"raw value inliner"*/ should "unfold an IntoField PropertyModel" in {
-    import aqua.model.inline.state.Mangler.Simple
     // a.field1.field2
     valueToModel[InliningState](`raw res.c`)
       .runA(
@@ -222,7 +221,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
     val (resVal, resTree) = valueToModel[InliningState](
       `raw x[ys[0]]`
     )
-      .runA(InliningState(noNames = Set("x", "ys")))
+      .runA(InliningState(noNames = toMangler(Set("x", "ys"))))
       .value
 
     resVal should be(
@@ -250,7 +249,9 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
   it should "desugarize properties with functors x[ys[ys.length]][2] and make proper flattener tags" in {
     val (resVal, resTree) = valueToModel[InliningState](
       `x[xs[ys.length]][xss[yss.length]]`
-    ).runA(InliningState(noNames = Set("x", "ys", "xs", "yss", "xss"))).value
+    ).runA(
+      InliningState(noNames = toMangler(Set("x", "ys", "xs", "yss", "xss")))
+    ).value
 
     resVal should be(
       VarModel(
@@ -325,7 +326,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
     val (resVal, resTree) = valueToModel[InliningState](
       `raw x[ys[0]][ys[1]]`
     )
-      .runA(InliningState(noNames = Set("x", "ys")))
+      .runA(InliningState(noNames = toMangler(Set("x", "ys"))))
       .value
 
     resVal should be(
@@ -371,7 +372,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
       IntoIndexRaw(idxRaw, ScalarType.string)
     )
 
-    val initState = InliningState(noNames = Set("x", "ys"))
+    val initState = InliningState(noNames = toMangler(Set("x", "ys")))
 
     // Here retrieve how size is inlined
     val (afterSizeState, (sizeModel, sizeTree)) =
@@ -420,7 +421,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
       )
 
     val (resVal, resTree) = valueToModel[InliningState](streamWithProps)
-      .runA(InliningState(noNames = Set("x", "ys")))
+      .runA(InliningState(noNames = toMangler(Set("x", "ys"))))
       .value
   }
 
@@ -428,7 +429,7 @@ class RawValueInlinerSpec extends AnyFlatSpec with Matchers with Inside {
     val (resVal, resTree) = valueToModel[InliningState](
       `raw x[zs[ys[0]]][ys[1]]`
     )
-      .runA(InliningState(noNames = Set("x", "ys", "zs")))
+      .runA(InliningState(noNames = toMangler(Set("x", "ys", "zs"))))
       .value
 
     // This is x[zs-0][ys-0]
diff --git a/model/raw/src/main/scala/aqua/raw/RawContext.scala b/model/raw/src/main/scala/aqua/raw/RawContext.scala
index 9f26d0286..6f4a5f2b0 100644
--- a/model/raw/src/main/scala/aqua/raw/RawContext.scala
+++ b/model/raw/src/main/scala/aqua/raw/RawContext.scala
@@ -10,7 +10,6 @@ import cats.data.Chain
 import cats.data.NonEmptyMap
 import cats.syntax.monoid.*
 import cats.syntax.option.*
-
 import scala.collection.immutable.SortedMap
 
 /**
diff --git a/parser/src/main/scala/aqua/parser/lift/FileSpan.scala b/parser/src/main/scala/aqua/parser/lift/FileSpan.scala
index e4b7613ac..ea991e093 100644
--- a/parser/src/main/scala/aqua/parser/lift/FileSpan.scala
+++ b/parser/src/main/scala/aqua/parser/lift/FileSpan.scala
@@ -15,7 +15,8 @@ case class FileSpan(name: String, locationMap: Eval[LocationMap], span: Span) {
    * @return FileSpan.Focus
    */
   def focus(ctx: Int): Option[FileSpan.Focus] =
-    span.focus(locationMap.value, ctx).map(FileSpan.Focus(name, locationMap, ctx, _))
+    span.
+      focus(locationMap.value, ctx).map(FileSpan.Focus(name, locationMap, ctx, _))
 
   override def hashCode(): Int = (name, span).hashCode()
 
diff --git a/semantics/src/main/scala/aqua/semantics/CompilerState.scala b/semantics/src/main/scala/aqua/semantics/CompilerState.scala
index 1ea492121..ef7783d57 100644
--- a/semantics/src/main/scala/aqua/semantics/CompilerState.scala
+++ b/semantics/src/main/scala/aqua/semantics/CompilerState.scala
@@ -1,12 +1,12 @@
 package aqua.semantics
 
+import aqua.mangler.ManglerState
 import aqua.parser.lexer.Token
 import aqua.raw.Raw
 import aqua.raw.RawContext
 import aqua.semantics.rules.abilities.AbilitiesState
 import aqua.semantics.rules.definitions.DefinitionsState
 import aqua.semantics.rules.locations.LocationsState
-import aqua.semantics.rules.mangler.ManglerState
 import aqua.semantics.rules.names.NamesState
 import aqua.semantics.rules.report.ReportState
 import aqua.semantics.rules.types.TypesState
diff --git a/semantics/src/main/scala/aqua/semantics/Semantics.scala b/semantics/src/main/scala/aqua/semantics/Semantics.scala
index bf76ea63f..9eebb9aa9 100644
--- a/semantics/src/main/scala/aqua/semantics/Semantics.scala
+++ b/semantics/src/main/scala/aqua/semantics/Semantics.scala
@@ -1,9 +1,8 @@
 package aqua.semantics
 
 import aqua.parser.Ast
-import aqua.semantics.SemanticError
 
-import cats.data.{Chain, EitherNec, EitherT, NonEmptyChain, ValidatedNec, Writer}
+import cats.data.{Chain, EitherT, NonEmptyChain, Writer}
 
 trait Semantics[S[_], C] {
 
diff --git a/semantics/src/main/scala/aqua/semantics/expr/func/ServiceIdSem.scala b/semantics/src/main/scala/aqua/semantics/expr/func/ServiceIdSem.scala
index 7274c8446..32dfc65a4 100644
--- a/semantics/src/main/scala/aqua/semantics/expr/func/ServiceIdSem.scala
+++ b/semantics/src/main/scala/aqua/semantics/expr/func/ServiceIdSem.scala
@@ -31,11 +31,11 @@ class ServiceIdSem[S[_]](val expr: ServiceIdExpr[S]) extends AnyVal {
       )
       serviceType <- EitherT.fromOptionF(
         T.resolveServiceType(expr.service),
-        Raw.error("Can not resolve service type")
+        Raw.error("Cannot resolve service type")
       )
       name <- EitherT.fromOptionF(
         A.renameService(expr.service),
-        Raw.error("Can not set service ID")
+        Raw.error("Cannot set service ID")
       )
       _ <- EitherT.liftF(
         N.derive(
diff --git a/semantics/src/main/scala/aqua/semantics/rules/locations/LocationsState.scala b/semantics/src/main/scala/aqua/semantics/rules/locations/LocationsState.scala
index dd11b98ed..d2178fe2a 100644
--- a/semantics/src/main/scala/aqua/semantics/rules/locations/LocationsState.scala
+++ b/semantics/src/main/scala/aqua/semantics/rules/locations/LocationsState.scala
@@ -21,8 +21,9 @@ case class LocationsState[S[_]](
     name: String,
     token: Token[S]
   ): List[VariableInfo[S]] = {
-    if (!vars.exists(_.definition.name == name))
-      logger.error(s"Unexpected. Cannot add occurrence for $name")
+    // TODO: this code lasts too long, but we can find errors in it.
+    // if (!vars.exists(_.definition.name == name))
+    //   logger.error(s"Unexpected. Cannot add occurrence for $name")
 
     vars.updateFirst(_.definition.name == name, v => v.copy(occurrences = token +: v.occurrences))
   }
diff --git a/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerInterpreter.scala b/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerInterpreter.scala
index 0eff5d809..ef97b0a6c 100644
--- a/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerInterpreter.scala
+++ b/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerInterpreter.scala
@@ -1,27 +1,17 @@
 package aqua.semantics.rules.mangler
 
+import aqua.mangler.ManglerState
+
 import cats.data.State
 import monocle.Lens
-import monocle.macros.GenLens
 
 class ManglerInterpreter[X](using
   lens: Lens[X, ManglerState]
 ) extends ManglerAlgebra[State[X, *]] {
 
   override def rename(name: String): State[X, String] =
-    for {
-      s <- get
-      newName = LazyList
-        .from(0)
-        .map(i => s"$name-$i")
-        .dropWhile(s.isForbidden)
-        .head
-      _ <- modify(_.forbid(newName))
-    } yield newName
-
-  private lazy val get: State[X, ManglerState] =
-    State.get[X].map(lens.get)
+    apply(_.forbidAndRename(name))
 
-  private def modify(f: ManglerState => ManglerState): State[X, Unit] =
-    State.modify[X](lens.modify(f))
+  private def apply[A](f: ManglerState => (ManglerState, A)): State[X, A] =
+    State.apply(lens.modifyF(f andThen (_.swap)) andThen (_.swap))
 }
diff --git a/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerState.scala b/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerState.scala
deleted file mode 100644
index 7d7f5dca8..000000000
--- a/semantics/src/main/scala/aqua/semantics/rules/mangler/ManglerState.scala
+++ /dev/null
@@ -1,24 +0,0 @@
-package aqua.semantics.rules.mangler
-
-import cats.kernel.Monoid
-
-final case class ManglerState(
-  forbidden: Set[String] = Set.empty
-) {
-
-  def isForbidden(name: String): Boolean =
-    forbidden.contains(name)
-
-  def forbid(name: String): ManglerState =
-    copy(forbidden = forbidden + name)
-}
-
-object ManglerState {
-
-  given Monoid[ManglerState] with {
-    override val empty: ManglerState = ManglerState()
-
-    override def combine(x: ManglerState, y: ManglerState): ManglerState =
-      ManglerState(forbidden = x.forbidden ++ y.forbidden)
-  }
-}
diff --git a/utils/logging/src/main/scala/aqua/logging/LogFormatter.scala b/utils/logging/src/main/scala/aqua/logging/LogFormatter.scala
index 36c29a623..62cacf1be 100644
--- a/utils/logging/src/main/scala/aqua/logging/LogFormatter.scala
+++ b/utils/logging/src/main/scala/aqua/logging/LogFormatter.scala
@@ -6,10 +6,10 @@ import scribe.{Level, Logger}
 object LogFormatter {
 
   val formatter: Formatter =
-    formatter"$date ${string("[")}$levelColored${string("]")} $messages$mdc"
+    formatter"$date $timeStamp ${string("[")}$levelColored${string("]")} $messages$mdc"
 
   val formatterWithFilename: Formatter =
-    formatter"$date $fileName ${string("[")}$levelColored${string("]")} $messages$mdc"
+    formatter"$date $timeStamp $fileName ${string("[")}$levelColored${string("]")} $messages$mdc"
 
   def initLogger(level: Option[Level]): Logger = {
     scribe.Logger.root
diff --git a/utils/mangler/src/main/scala/aqua/mangler/ManglerState.scala b/utils/mangler/src/main/scala/aqua/mangler/ManglerState.scala
new file mode 100644
index 000000000..2cad60869
--- /dev/null
+++ b/utils/mangler/src/main/scala/aqua/mangler/ManglerState.scala
@@ -0,0 +1,65 @@
+package aqua.mangler
+
+import cats.Monoid
+
+import scala.annotation.tailrec
+
+case class ManglerState(namesNumbers: Map[String, Int] = Map.empty) {
+
+  private def genName(name: String, n: Int) =
+    s"$name-$n"
+
+  // find unique names that have not yet been used
+  def findNewNames(introduce: Set[String]): (ManglerState, Map[String, String]) = {
+    introduce.foldLeft(this, Map.empty[String, String]) {
+      case ((state, newNames), name) =>
+        val namesNumbers = state.namesNumbers
+        if (!namesNumbers.contains(name)) {
+          val newState = state.copy(
+            namesNumbers = namesNumbers
+              .updated(name, 0)
+          )
+
+          (newState, newNames)
+        } else {
+          val (newNumber, newName) = LazyList
+            .from(namesNumbers.getOrElse(name, 0))
+            .map(n => n -> genName(name, n))
+            .dropWhile { case (_, newName) =>
+              namesNumbers.contains(newName)
+            }
+            .head
+          val newState = copy(
+            namesNumbers = namesNumbers
+              .updated(name, newNumber + 1)
+              .updated(newName, 0)
+          )
+
+          (newState, newNames + (name -> newName))
+        }
+    }
+  }
+
+  // add names to used list
+  def forbid(names: Set[String]): ManglerState = {
+    val newLastNumbers = names.map(n => n -> namesNumbers.getOrElse(n, 0)).toMap
+    copy(namesNumbers = newLastNumbers ++ namesNumbers)
+  }
+
+  // forbid name and return unique
+  def forbidAndRename(name: String): (ManglerState, String) = {
+    val set = Set(name)
+    val (newState, newNames) = forbid(set).findNewNames(set)
+    (newState, newNames(name))
+  }
+}
+
+object ManglerState {
+
+  given Monoid[ManglerState] with {
+    override val empty: ManglerState = ManglerState()
+
+    override def combine(x: ManglerState, y: ManglerState): ManglerState =
+      ManglerState(namesNumbers = x.namesNumbers ++ y.namesNumbers)
+  }
+}