Loop of length 17 starting with a string of length 9
found after enumerating 4339 derivations:

.b.cbacbacb
	rule b -> ac at position 0
.ac.cbacbacb
	rule ccb -> bbba at position 1
.abbba.acbacb
	rule b -> ac at position 2
.abacba.acbacb
	rule b -> ac at position 4
.abacaca.acbacb
	rule aa ->  at position 6
.abacac.cbacb
	rule ccb -> bbba at position 5
.abacabbba.acb
	rule b -> ac at position 5
.abacaacbba.acb
	rule aa ->  at position 4
.abaccbba.acb
	rule ccb -> bbba at position 3
.ababbbaba.acb
	rule b -> ac at position 3
.abaacbbaba.acb
	rule aa ->  at position 2
.abcbbaba.acb
	rule b -> ac at position 4
.abcbacaba.acb
	rule b -> ac at position 7
.abcbacaaca.acb
	rule aa ->  at position 6
.abcbacca.acb
	rule aa ->  at position 7
.abcbacc.cb
	rule ccb -> bbba at position 6
.abcbacbbba.
	rule b -> ac at position 7
.abcbacbacba.