Loop of length 17 starting with a string of length 6
found after enumerating 9411 derivations:

.cc.acac
	rule cc -> abcbb at position 0
.abcbb.acac
	rule ba -> ac at position 4
.abcbac.cac
	rule a ->  at position 4
.abcbc.cac
	rule cc -> abcbb at position 4
.abcbabcbb.ac
	rule ba -> ac at position 3
.abcacbcbb.ac
	rule a ->  at position 3
.abccbcbb.ac
	rule ba -> ac at position 7
.abccbcbac.c
	rule ba -> ac at position 6
.abccbcacc.c
	rule a ->  at position 6
.abccbccc.c
	rule cc -> abcbb at position 5
.abccbabcbbc.c
	rule ba -> ac at position 4
.abccacbcbbc.c
	rule cc -> abcbb at position 10
.abccacbcbbabcbb.
	rule ba -> ac at position 9
.abccacbcbacbcbb.
	rule ba -> ac at position 8
.abccacbcaccbcbb.
	rule a ->  at position 8
.abccacbcccbcbb.
	rule cc -> abcbb at position 7
.abccacbabcbbcbcbb.
	rule ba -> ac at position 6
.abccacacbcbbcbcbb.