0.00/0.26 NO 0.00/0.26 0.00/0.26 0.00/0.26 The system was reversed. 0.00/0.26 0.00/0.26 Remains to prove termination of the 2-rule system 0.00/0.26 { a a a -> b a b , 0.00/0.26 b a b -> a b a } 0.00/0.26 0.00/0.26 0.00/0.26 Loop of length 6 starting with a string of length 6 using right expansion 0.00/0.26 and the encoding {a=a, b=b}: 0.00/0.26 0.00/0.26 .aaa.baa 0.00/0.26 rule aaa -> bab at position 0 0.00/0.26 .bab.baa 0.00/0.26 rule bab -> aba at position 0 0.00/0.26 .aba.baa 0.00/0.26 rule bab -> aba at position 1 0.00/0.26 .aaba.aa 0.00/0.26 rule aaa -> bab at position 3 0.00/0.26 .aabbab. 0.00/0.26 rule bab -> aba at position 3 0.00/0.26 .aababa. 0.00/0.26 rule bab -> aba at position 2 0.00/0.26 .aaabaa. 0.00/0.31 EOF