0.00/0.28 NO 0.00/0.28 0.00/0.28 0.00/0.28 The system was reversed. 0.00/0.28 0.00/0.28 Remains to prove termination of the 4-rule system 0.00/0.28 { a -> , 0.00/0.28 b a -> a b c a b , 0.00/0.28 b -> a , 0.00/0.28 c c -> } 0.00/0.28 0.00/0.28 0.00/0.28 Loop of length 8 starting with a string of length 3 using right expansion 0.00/0.28 and the encoding {a=a, b=b, c=c}: 0.00/0.28 0.00/0.28 .ba.a 0.00/0.28 rule ba -> abcab at position 0 0.00/0.28 .abcab.a 0.00/0.28 rule a -> at position 3 0.00/0.28 .abcb.a 0.00/0.28 rule ba -> abcab at position 3 0.00/0.28 .abcabcab. 0.00/0.28 rule a -> at position 3 0.00/0.28 .abcbcab. 0.00/0.28 rule b -> a at position 3 0.00/0.28 .abcacab. 0.00/0.28 rule a -> at position 3 0.00/0.28 .abccab. 0.00/0.28 rule cc -> at position 2 0.00/0.28 .abab. 0.00/0.28 rule b -> a at position 3 0.00/0.28 .abaa. 0.00/0.31 EOF