Loop of length 16 starting with a string of length 9
found after enumerating 5458 derivations:

.cba.aaaaaa
	rule cba -> aaacca at position 0
.aaacca.aaaaaa
	rule aa -> b at position 5
.aaaccb.aaaaa
	rule cba -> aaacca at position 4
.aaacaaacca.aaaa
	rule aa -> b at position 4
.aaacbacca.aaaa
	rule aa -> b at position 8
.aaacbaccb.aaa
	rule cba -> aaacca at position 7
.aaacbacaaacca.aa
	rule aa -> b at position 7
.aaacbacbacca.aa
	rule cba -> aaacca at position 6
.aaacbaaaaccacca.aa
	rule aa -> b at position 14
.aaacbaaaaccaccb.a
	rule cba -> aaacca at position 13
.aaacbaaaaccacaaacca.
	rule aa -> b at position 13
.aaacbaaaaccacbacca.
	rule cba -> aaacca at position 12
.aaacbaaaaccaaaaccacca.
	rule aa -> b at position 11
.aaacbaaaaccbaaccacca.
	rule cba -> aaacca at position 10
.aaacbaaaacaaaccaaccacca.
	rule aa -> b at position 10
.aaacbaaaacbaccaaccacca.
	rule cba -> aaacca at position 9
.aaacbaaaaaaaccaccaaccacca.