Loop of length 12 starting with a string of length 7
found after enumerating 3896 derivations:

.ba.aaaaa
	rule ba -> acb at position 0
.acb.aaaaa
	rule ba -> acb at position 2
.acacb.aaaa
	rule cac -> aab at position 1
.aaabb.aaaa
	rule ba -> acb at position 4
.aaabacb.aaa
	rule ba -> acb at position 6
.aaabacacb.aa
	rule cac -> aab at position 5
.aaabaaabb.aa
	rule ba -> acb at position 8
.aaabaaabacb.a
	rule ba -> acb at position 7
.aaabaaaacbcb.a
	rule ba -> acb at position 11
.aaabaaaacbcacb.
	rule cac -> aab at position 10
.aaabaaaacbaabb.
	rule ba -> acb at position 9
.aaabaaaacacbabb.
	rule cac -> aab at position 8
.aaabaaaaaabbabb.