Loop of length 16 starting with a string of length 10
found after enumerating 713 derivations:

.ab.bbbbbbbb
	rule ab -> c at position 0
.c.bbbbbbbb
	rule cbb -> bbbaab at position 0
.bbbaab.bbbbbb
	rule ab -> c at position 4
.bbbac.bbbbbb
	rule cbb -> bbbaab at position 4
.bbbabbbaab.bbbb
	rule ab -> c at position 8
.bbbabbbac.bbbb
	rule cbb -> bbbaab at position 8
.bbbabbbabbbaab.bb
	rule ab -> c at position 7
.bbbabbbcbbaab.bb
	rule cbb -> bbbaab at position 7
.bbbabbbbbbaabaab.bb
	rule ab -> c at position 11
.bbbabbbbbbacaab.bb
	rule ab -> c at position 13
.bbbabbbbbbacac.bb
	rule cbb -> bbbaab at position 13
.bbbabbbbbbacabbbaab.
	rule ab -> c at position 12
.bbbabbbbbbaccbbaab.
	rule cbb -> bbbaab at position 12
.bbbabbbbbbacbbbaabaab.
	rule cbb -> bbbaab at position 11
.bbbabbbbbbabbbaabbaabaab.
	rule ab -> c at position 10
.bbbabbbbbbcbbaabbaabaab.
	rule cbb -> bbbaab at position 10
.bbbabbbbbbbbbaabaabbaabaab.