Loop of length 23 starting with a string of length 6
found after enumerating 26067 derivations:

.ba.aaaa
	rule ba -> acab at position 0
.acab.aaaa
	rule a ->  at position 2
.acb.aaaa
	rule ba -> acab at position 2
.acacab.aaa
	rule a ->  at position 2
.accab.aaa
	rule cc -> b at position 1
.abab.aaa
	rule ba -> acab at position 3
.abaacab.aa
	rule a ->  at position 5
.abaacb.aa
	rule ba -> acab at position 5
.abaacacab.a
	rule a ->  at position 5
.abaaccab.a
	rule cc -> b at position 4
.abaabab.a
	rule ba -> acab at position 4
.abaaacabb.a
	rule a ->  at position 6
.abaaacbb.a
	rule ba -> acab at position 7
.abaaacbacab.
	rule ba -> acab at position 6
.abaaacacabcab.
	rule a ->  at position 6
.abaaaccabcab.
	rule cc -> b at position 5
.abaaababcab.
	rule ba -> acab at position 5
.abaaaacabbcab.
	rule a ->  at position 7
.abaaaacbbcab.
	rule bc ->  at position 8
.abaaaacbab.
	rule ba -> acab at position 7
.abaaaacacabb.
	rule a ->  at position 7
.abaaaaccabb.
	rule cc -> b at position 6
.abaaaababb.
	rule ba -> acab at position 6
.abaaaaacabbb.