Loop of length 8 starting with a string of length 4
found after enumerating 645 derivations:

.ba.aa
	rule ba -> aabcab at position 0
.aabcab.aa
	rule a ->  at position 4
.aabcb.aa
	rule ba -> aabcab at position 4
.aabcaabcab.a
	rule a ->  at position 4
.aabcabcab.a
	rule a ->  at position 4
.aabcbcab.a
	rule b ->  at position 4
.aabccab.a
	rule cc ->  at position 3
.aabab.a
	rule ba -> aabcab at position 4
.aabaaabcab.