Loop of length 28 starting with a string of length 10
found after enumerating 7659 derivations:

.ab.bbbbbbbb
	rule ab -> ca at position 0
.ca.bbbbbbbb
	rule ab -> ca at position 1
.cca.bbbbbbb
	rule ab -> ca at position 2
.ccca.bbbbbb
	rule ccc -> bbbac at position 0
.bbbaca.bbbbbb
	rule ab -> ca at position 5
.bbbacca.bbbbb
	rule ab -> ca at position 6
.bbbaccca.bbbb
	rule ccc -> bbbac at position 4
.bbbabbbaca.bbbb
	rule ab -> ca at position 9
.bbbabbbacca.bbb
	rule ab -> ca at position 10
.bbbabbbaccca.bb
	rule ccc -> bbbac at position 8
.bbbabbbabbbaca.bb
	rule ab -> ca at position 7
.bbbabbbcabbaca.bb
	rule ab -> ca at position 8
.bbbabbbccabaca.bb
	rule ab -> ca at position 9
.bbbabbbcccaaca.bb
	rule ccc -> bbbac at position 7
.bbbabbbbbbacaaca.bb
	rule ab -> ca at position 15
.bbbabbbbbbacaacca.b
	rule ab -> ca at position 16
.bbbabbbbbbacaaccca.
	rule ccc -> bbbac at position 14
.bbbabbbbbbacaabbbaca.
	rule ab -> ca at position 13
.bbbabbbbbbacacabbaca.
	rule ab -> ca at position 14
.bbbabbbbbbacaccabaca.
	rule ab -> ca at position 15
.bbbabbbbbbacacccaaca.
	rule ccc -> bbbac at position 13
.bbbabbbbbbacabbbacaaca.
	rule ab -> ca at position 12
.bbbabbbbbbaccabbacaaca.
	rule ab -> ca at position 13
.bbbabbbbbbacccabacaaca.
	rule ccc -> bbbac at position 11
.bbbabbbbbbabbbacabacaaca.
	rule ab -> ca at position 10
.bbbabbbbbbcabbacabacaaca.
	rule ab -> ca at position 11
.bbbabbbbbbccabacabacaaca.
	rule ab -> ca at position 12
.bbbabbbbbbcccaacabacaaca.
	rule ccc -> bbbac at position 10
.bbbabbbbbbbbbacaacabacaaca.