Loop of length 17 starting with a string of length 10
found after enumerating 34043 derivations:

.cabb.bbbbbb
	rule cabb -> abacca at position 0
.abacca.bbbbbb
	rule cabb -> abacca at position 4
.abacabacca.bbbb
	rule a -> b at position 6
.abacabbcca.bbbb
	rule cabb -> abacca at position 8
.abacabbcabacca.bb
	rule a -> b at position 10
.abacabbcabbcca.bb
	rule cabb -> abacca at position 7
.abacabbabaccacca.bb
	rule a -> b at position 7
.abacabbbbaccacca.bb
	rule a -> b at position 9
.abacabbbbbccacca.bb
	rule cabb -> abacca at position 14
.abacabbbbbccacabacca.
	rule a -> b at position 16
.abacabbbbbccacabbcca.
	rule cabb -> abacca at position 13
.abacabbbbbccaabaccacca.
	rule a -> b at position 13
.abacabbbbbccabbaccacca.
	rule cabb -> abacca at position 11
.abacabbbbbcabaccaaccacca.
	rule a -> b at position 13
.abacabbbbbcabbccaaccacca.
	rule cabb -> abacca at position 10
.abacabbbbbabaccaccaaccacca.
	rule a -> b at position 10
.abacabbbbbbbaccaccaaccacca.
	rule a -> b at position 12
.abacabbbbbbbbccaccaaccacca.