0.00/0.29 NO 0.00/0.29 0.00/0.29 0.00/0.29 The system was reversed. 0.00/0.29 0.00/0.29 Remains to prove termination of the 4-rule system 0.00/0.29 { a -> , 0.00/0.29 b a -> a a b c b , 0.00/0.29 b -> a , 0.00/0.29 c c -> } 0.00/0.29 0.00/0.29 0.00/0.29 Loop of length 9 starting with a string of length 4 using right expansion 0.00/0.29 and the encoding {a=a, b=b, c=c}: 0.00/0.29 0.00/0.29 .ba.aa 0.00/0.29 rule ba -> aabcb at position 0 0.00/0.29 .aabcb.aa 0.00/0.29 rule ba -> aabcb at position 4 0.00/0.29 .aabcaabcb.a 0.00/0.29 rule a -> at position 4 0.00/0.29 .aabcabcb.a 0.00/0.29 rule a -> at position 4 0.00/0.29 .aabcbcb.a 0.00/0.29 rule b -> a at position 4 0.00/0.29 .aabcacb.a 0.00/0.29 rule a -> at position 4 0.00/0.29 .aabccb.a 0.00/0.29 rule cc -> at position 3 0.00/0.29 .aabb.a 0.00/0.29 rule ba -> aabcb at position 3 0.00/0.29 .aabaabcb. 0.00/0.29 rule b -> a at position 5 0.00/0.29 .aabaaacb. 0.00/0.33 EOF