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 4-rule system 0.00/0.26 { a -> , 0.00/0.26 b a -> a a b b c a , 0.00/0.26 b -> , 0.00/0.26 c c -> } 0.00/0.26 0.00/0.26 0.00/0.26 Loop of length 7 starting with a string of length 4 using right expansion 0.00/0.26 and the encoding {a=a, b=b, c=c}: 0.00/0.26 0.00/0.26 .ba.ca 0.00/0.26 rule ba -> aabbca at position 0 0.00/0.26 .aabbca.ca 0.00/0.26 rule a -> at position 5 0.00/0.26 .aabbc.ca 0.00/0.26 rule cc -> at position 4 0.00/0.26 .aabb.a 0.00/0.26 rule ba -> aabbca at position 3 0.00/0.26 .aabaabbca. 0.00/0.26 rule a -> at position 3 0.00/0.26 .aababbca. 0.00/0.26 rule b -> at position 4 0.00/0.26 .aababca. 0.00/0.26 rule b -> at position 4 0.00/0.26 .aabaca. 0.00/0.29 EOF