remove most uses of list(somedict.keys()) in Demo scripts
diff --git a/Demo/scripts/markov.py b/Demo/scripts/markov.py
index a91e359..3dc57ce 100755
--- a/Demo/scripts/markov.py
+++ b/Demo/scripts/markov.py
@@ -87,7 +87,7 @@
         return
     if debug: print('done.')
     if debug > 1:
-        for key in list(m.trans.keys()):
+        for key in m.trans.keys():
             if key is None or len(key) < histsize:
                 print(repr(key), m.trans[key])
         if histsize == 0: print(repr(''), m.trans[''])