Loop of length 8 starting with a string of length 5
found after enumerating 1314 derivations:

.ab.cbb
	rule ab -> bbaaca at position 0
.bbaaca.cbb
	rule a ->  at position 5
.bbaac.cbb
	rule cc ->  at position 4
.bbaa.bb
	rule ab -> bbaaca at position 3
.bbabbaaca.b
	rule b ->  at position 3
.bbabaaca.b
	rule a ->  at position 4
.bbabaca.b
	rule a ->  at position 4
.bbabca.b
	rule ab -> bbaaca at position 5
.bbabcbbaaca.