Loop of length 7 starting with a string of length 3
found after enumerating 463 derivations:

.ba.a
	rule ba -> abcaab at position 0
.abcaab.a
	rule a ->  at position 3
.abcab.a
	rule a ->  at position 3
.abcb.a
	rule ba -> abcaab at position 3
.abcabcaab.
	rule a ->  at position 3
.abcbcaab.
	rule b ->  at position 3
.abccaab.
	rule cc ->  at position 2
.abaab.