diff --git a/LuaLibs/BeamExec.lua b/LuaLibs/BeamExec.lua
index a2a8116..64d7af8 100644
--- a/LuaLibs/BeamExec.lua
+++ b/LuaLibs/BeamExec.lua
@@ -259,19 +259,19 @@ local function IsCombinationAvailable( sCombination, nUnloadPos, bSquareSection)
       end
    -- ADVANCED : come BASIC ma ammesse anche le prerotazioni (posizione di scarico può essere diversa da posizione iniziale)
    elseif BEAM.Rotation.bAdvanced then
-      local Rotation90 = EgtIf( nUnloadPos + 1 > 4, nUnloadPos + 1 - 4, nUnloadPos + 1)
-      local Rotation180 = EgtIf( nUnloadPos + 2 > 4, nUnloadPos + 2 - 4, nUnloadPos + 2)
-      local ExtraRotation = EgtIf( nUnloadPos + 3 > 4, nUnloadPos + 3 - 4, nUnloadPos + 3)
+      local nRotation90 = EgtIf( nUnloadPos + 1 > 4, nUnloadPos + 1 - 4, nUnloadPos + 1)
+      local nRotation180 = EgtIf( nUnloadPos + 2 > 4, nUnloadPos + 2 - 4, nUnloadPos + 2)
+      local nExtraRotation = EgtIf( nUnloadPos + 3 > 4, nUnloadPos + 3 - 4, nUnloadPos + 3)
 
       if not bSquareSection and ( nUnloadPos == 2 or nUnloadPos == 4) then
          return false
       else
-         if string.sub( sCombination, nUnloadPos, nUnloadPos) ~= '1' or string.sub( sCombination, ExtraRotation, ExtraRotation) == '1' then
+         if string.sub( sCombination, nUnloadPos, nUnloadPos) ~= '1' or string.sub( sCombination, nExtraRotation, nExtraRotation) == '1' then
             return false
          else
-            if not BeamData.ROT90 and string.sub( sCombination, Rotation90, Rotation90) == '1' then
+            if not BeamData.ROT90 and string.sub( sCombination, nRotation90, nRotation90) == '1' then
                return false
-            elseif not BeamData.ROT180 and string.sub( sCombination, Rotation180, Rotation180) == '1' then
+            elseif not BeamData.ROT180 and string.sub( sCombination, nRotation180, nRotation180) == '1' then
                return false
             else
                return true