diff --git a/finenight/python/fsa.py b/finenight/python/fsa.py
index 9bc9a19..8399d52 100644
--- a/finenight/python/fsa.py
+++ b/finenight/python/fsa.py
@@ -2,7 +2,7 @@
 import pdb
 
 from error import *
-from nameGenerator import IndexNameGenerator
+from nameGenerator import PlainIndexNameGenerator
 from pprint import pprint, pformat
 from state import State
 
@@ -56,12 +56,12 @@ def __rename__(fsa, nameGenerator):
 def rename(nfa, nameGenerator = None):
     """This function will return a FSA with all states renamed
     according to the nameGenerator class. If the nameGenerator
-    is not given, the function will use the IndexNameGenerator
+    is not given, the function will use the PlainIndexNameGenerator
     class.
     """
     
     if nameGenerator is None:
-        nameGenerator = IndexNameGenerator()
+        nameGenerator = PlainIndexNameGenerator()
 
     newNfa = copy.deepcopy(nfa)
     newKeys = __rename__(nfa, nameGenerator)
@@ -97,7 +97,7 @@ def binaryOperationRenaming(lhs, rhs, renameStates, nameGenerator):
     #this is the renaming procedures
     if renameStates is True:
         if nameGenerator is None:
-            nameGenerator = IndexNameGenerator()
+            nameGenerator = PlainIndexNameGenerator()
         newLhs = rename(lhs, nameGenerator)
         newRhs = rename(rhs, nameGenerator)
     elif isNameColliding(lhs, rhs) is True:
diff --git a/finenight/python/nameGenerator.py b/finenight/python/nameGenerator.py
index 88753b9..94e2d71 100644
--- a/finenight/python/nameGenerator.py
+++ b/finenight/python/nameGenerator.py
@@ -12,3 +12,16 @@ def generate(self):
         self.index += 1
         return name
 
+class PlainIndexNameGenerator:
+    """Renaming states with this class is not stable, that is,
+    it's not sure that renaming the FSA will give allways the
+    same result.
+    """
+    def __init__(self):
+        self.index = 0
+
+    def generate(self):
+        name = str(self.index)
+        self.index += 1
+        return name
+