diff --git a/Configuration/GlobalAssemblyInfo.cs b/Configuration/GlobalAssemblyInfo.cs
index 459ace208..d12e4d008 100644
--- a/Configuration/GlobalAssemblyInfo.cs
+++ b/Configuration/GlobalAssemblyInfo.cs
@@ -15,7 +15,7 @@ internal static class RevisionClass
 	public const string Major = "3";
 	public const string Minor = "4";
 	public const string Build = "2";
-	public const string Revision = "2002";
+	public const string Revision = "2003";
 
         public const string MainVersion = Major + "." + Minor;
 	public const string FullVersion = Major + "." + Minor + "." + Build + "." + Revision;
diff --git a/Configuration/Version.defs b/Configuration/Version.defs
index 11fc31240..01e9b3ab2 100644
--- a/Configuration/Version.defs
+++ b/Configuration/Version.defs
@@ -1,4 +1,4 @@
-%MINOR%=4
-%REVISION%=2002
 %COREVERSION%=2
+%REVISION%=2003
+%MINOR%=4
 %MAJOR%=3
diff --git a/ReleaseGenerators/PascalABCNET_version.nsh b/ReleaseGenerators/PascalABCNET_version.nsh
index 23129d8b0..858d3fd8d 100644
--- a/ReleaseGenerators/PascalABCNET_version.nsh
+++ b/ReleaseGenerators/PascalABCNET_version.nsh
@@ -1 +1 @@
-!define VERSION '3.4.2.2002'
+!define VERSION '3.4.2.2003'
diff --git a/TestSuite/Set_char_string.pas b/TestSuite/Set_char_string.pas
new file mode 100644
index 000000000..1c3c4ac7f
--- /dev/null
+++ b/TestSuite/Set_char_string.pas
@@ -0,0 +1,5 @@
+begin
+  var s: set of string := ['b','d '];
+  foreach var o in s do
+    Assert(o.GetType = typeof(string));
+end.
\ No newline at end of file
diff --git a/TreeConverter/TreeConversion/syntax_tree_visitor.cs b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
index c87e8a9ff..b2c53e295 100644
--- a/TreeConverter/TreeConversion/syntax_tree_visitor.cs
+++ b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
@@ -4842,8 +4842,6 @@ namespace PascalABCCompiler.TreeConverter
                         types.AddElement(en.type);
                     }
                 }
-            expressions_list consts_copy = new expressions_list();
-            consts_copy.AddRange(consts);
             type_node ctn = null;
             if (consts.Count > 0)
             {
@@ -4855,7 +4853,22 @@ namespace PascalABCCompiler.TreeConverter
 
             }
             else ctn = SystemLibrary.SystemLibInitializer.TypedSetType.sym_info as type_node;
+
+            /*if (el_type == SystemLibrary.SystemLibrary.string_type)
+            {
+                for (int i = 0; i < consts.Count; i++)
+                    if (consts[i].type == SystemLibrary.SystemLibrary.char_type)
+                    {
+                        consts[i] = convertion_data_and_alghoritms.convert_type(consts[i], el_type);
+                    }
+            } */ // Не работает ! SSM 19.03.19
+
+            expressions_list consts_copy = new expressions_list();
+            consts_copy.AddRange(consts);
+
             function_node fn = convertion_data_and_alghoritms.select_function(consts, SystemLibrary.SystemLibInitializer.CreateSetProcedure.SymbolInfo, (SystemLibrary.SystemLibInitializer.CreateSetProcedure.sym_info is common_namespace_function_node)?(SystemLibrary.SystemLibInitializer.CreateSetProcedure.sym_info as common_namespace_function_node).loc:null);
+
+
             if (fn is common_namespace_function_node)
             {
                 common_namespace_function_call cnfc = new common_namespace_function_call(fn as common_namespace_function_node, get_location(_pascal_set_constant));
diff --git a/bin/Lib/PABCSystem.pas b/bin/Lib/PABCSystem.pas
index fd53256ce..4272c192e 100644
--- a/bin/Lib/PABCSystem.pas
+++ b/bin/Lib/PABCSystem.pas
@@ -3031,7 +3031,7 @@ begin
   Result.high := high;
 end;
 
-[System.Diagnostics.DebuggerStepThrough]
+//[System.Diagnostics.DebuggerStepThrough]
 function CreateObjDiapason(low, high: object): Diapason;
 begin
   Result.clow := low;
@@ -3041,9 +3041,39 @@ end;
 [System.Diagnostics.DebuggerStepThrough]
 function CreateSet(params elems: array of object): TypedSet;
 begin
+  var chars := false;
+  var strings := false;
+  var others := false;
+  foreach var x in elems do
+  begin
+    if (x is char) or (x is Diapason) and (Diapason(x).clow is char) then
+      chars := true
+    else if x is string then
+      strings := true
+    else 
+    begin
+      others := true;
+      break
+    end;  
+  end;
+  
   Result := new TypedSet();
-  for var i := 0 to elems.Length - 1 do
-    Result.IncludeElement(elems[i]);
+  
+  if chars and strings and not others then
+    foreach var x in elems do
+      if x is char then
+        Result.IncludeElement(x.ToString)
+      else if (x is Diapason) and (Diapason(x).clow is char) then
+      begin
+        var c1 := char(Diapason(x).clow);
+        var c2 := char(Diapason(x).chigh);
+        for var cc := c1 to c2 do
+          Result.IncludeElement(cc.ToString)
+      end
+      else Result.IncludeElement(x)
+  else    
+    foreach var x in elems do
+      Result.IncludeElement(x);
 end;
 
 [System.Diagnostics.DebuggerStepThrough]