diff --git a/Configuration/GlobalAssemblyInfo.cs b/Configuration/GlobalAssemblyInfo.cs
index a3c5b838d..d90aa57d0 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 = "7";
 	public const string Build = "1";
-	public const string Revision = "2781";
+	public const string Revision = "2783";
 
         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 0925067cd..3e6c8120e 100644
--- a/Configuration/Version.defs
+++ b/Configuration/Version.defs
@@ -1,4 +1,4 @@
 %MINOR%=7
-%REVISION%=2781
+%REVISION%=2783
 %COREVERSION%=1
 %MAJOR%=3
diff --git a/Release/pabcversion.txt b/Release/pabcversion.txt
index 27ec17c43..4b9b9e4bf 100644
--- a/Release/pabcversion.txt
+++ b/Release/pabcversion.txt
@@ -1 +1 @@
-3.7.1.2781
+3.7.1.2783
diff --git a/ReleaseGenerators/PascalABCNET_version.nsh b/ReleaseGenerators/PascalABCNET_version.nsh
index 9c1428949..36f98fc54 100644
--- a/ReleaseGenerators/PascalABCNET_version.nsh
+++ b/ReleaseGenerators/PascalABCNET_version.nsh
@@ -1 +1 @@
-!define VERSION '3.7.1.2781'
+!define VERSION '3.7.1.2783'
diff --git a/TestSuite/CompilationSamples/PABCSystem.pas b/TestSuite/CompilationSamples/PABCSystem.pas
index 9d32b6cff..9a9da0a12 100644
--- a/TestSuite/CompilationSamples/PABCSystem.pas
+++ b/TestSuite/CompilationSamples/PABCSystem.pas
@@ -11830,7 +11830,7 @@ begin
   Result := True;
 end;
 
-/// Возвращает все перестановки
+/// Возвращает все перестановки множества элементов, заданного массивом
 function Permutations<T>(Self: array of T): sequence of array of T; extensionmethod;
 begin
   var a := Self;
@@ -11844,6 +11844,44 @@ begin
   until not NextPermutation(ind);  
 end;
 
+/// Возвращает все частичные перестановки из n элементов по m 
+function Permutations<T>(Self: array of T; m: integer): sequence of array of T; extensionmethod;
+begin
+  Result := Self.Combinations(m).SelectMany(c->c.Permutations);
+end;
+
+
+/// Возвращает n-тую декартову степень множества элементов, заданного массивом
+function Cartesian<T>(Self: array of T; n: integer): sequence of array of T; extensionmethod;
+begin
+  var r := new integer[n];
+  var ar1 := new T[n];
+  for var i:=0 to n-1 do
+    ar1[i] := Self[r[i]];
+  yield ar1;
+  
+  var m := Self.Length;
+  while True do
+  begin
+    var i := n-1;  
+    r[i] += 1;
+    while r[i]>=m do
+    begin
+      r[i] := 0;
+      i -= 1;
+      if i<0 then
+        exit;
+      r[i] += 1;
+    end;
+    
+    var ar := new T[n];
+    for var j:=0 to n-1 do
+      ar[j] := Self[r[j]];
+    yield ar;
+  end;  
+end;
+
+
 // Внутренние функции для одномерных массивов
 
 ///-- 
diff --git a/bin/Lib/PABCSystem.pas b/bin/Lib/PABCSystem.pas
index 4167aed22..9ced3bea4 100644
--- a/bin/Lib/PABCSystem.pas
+++ b/bin/Lib/PABCSystem.pas
@@ -7222,7 +7222,9 @@ end;
 
 function Eof(f: Text): boolean;
 begin
-  if f.sr <> nil then
+  if f = input then
+    Result := Eof
+  else if f.sr <> nil then
     Result := f.sr.EndOfStream
   else if f.sw <> nil then
     raise new IOException(GetTranslation(EOF_FOR_TEXT_WRITEOPENED))
@@ -7231,7 +7233,9 @@ end;
 
 function Eoln(f: Text): boolean;
 begin
-  if f.sr <> nil then
+  if f = input then
+    Result := Eoln
+  else if f.sr <> nil then
     Result := f.sr.EndOfStream or (f.sr.Peek = 13) or (f.sr.Peek = 10) 
   else if f.sw <> nil then
     raise new IOException(GetTranslation(EOLN_FOR_TEXT_WRITEOPENED))
@@ -7240,6 +7244,11 @@ end;
 
 function SeekEof(f: Text): boolean;
 begin
+  if f = input then
+  begin  
+    Result := SeekEof;
+    exit;
+  end;  
   if f.sw <> nil then
     raise new IOException(GetTranslation(SEEKEOF_FOR_TEXT_WRITEOPENED));
   if f.sr = nil then  
@@ -7257,6 +7266,11 @@ end;
 
 function SeekEoln(f: Text): boolean;
 begin
+  if f = input then
+  begin  
+    Result := SeekEoln;
+    exit;
+  end;  
   if f.sw <> nil then
     raise new IOException(GetTranslation(SEEKEOLN_FOR_TEXT_WRITEOPENED));
   if f.sr = nil then  
@@ -11844,6 +11858,13 @@ begin
   until not NextPermutation(ind);  
 end;
 
+/// Возвращает все частичные перестановки из n элементов по m 
+function Permutations<T>(Self: array of T; m: integer): sequence of array of T; extensionmethod;
+begin
+  Result := Self.Combinations(m).SelectMany(c->c.Permutations);
+end;
+
+
 /// Возвращает n-тую декартову степень множества элементов, заданного массивом
 function Cartesian<T>(Self: array of T; n: integer): sequence of array of T; extensionmethod;
 begin