Loop of length 24 starting with a string of length 10
found after enumerating 676506 derivations:

.cabb.bbbbbb
	rule cabb -> aaacca at position 0
.aaacca.bbbbbb
	rule cabb -> aaacca at position 4
.aaacaaacca.bbbb
	rule a -> b at position 5
.aaacabacca.bbbb
	rule a -> b at position 6
.aaacabbcca.bbbb
	rule cabb -> aaacca at position 8
.aaacabbcaaacca.bb
	rule a -> b at position 9
.aaacabbcabacca.bb
	rule a -> b at position 10
.aaacabbcabbcca.bb
	rule cabb -> aaacca at position 7
.aaacabbaaaccacca.bb
	rule a -> b at position 7
.aaacabbbaaccacca.bb
	rule a -> b at position 8
.aaacabbbbaccacca.bb
	rule a -> b at position 9
.aaacabbbbbccacca.bb
	rule cabb -> aaacca at position 14
.aaacabbbbbccacaaacca.
	rule a -> b at position 15
.aaacabbbbbccacabacca.
	rule a -> b at position 16
.aaacabbbbbccacabbcca.
	rule cabb -> aaacca at position 13
.aaacabbbbbccaaaaccacca.
	rule a -> b at position 13
.aaacabbbbbccabaaccacca.
	rule a -> b at position 14
.aaacabbbbbccabbaccacca.
	rule cabb -> aaacca at position 11
.aaacabbbbbcaaaccaaccacca.
	rule a -> b at position 12
.aaacabbbbbcabaccaaccacca.
	rule a -> b at position 13
.aaacabbbbbcabbccaaccacca.
	rule cabb -> aaacca at position 10
.aaacabbbbbaaaccaccaaccacca.
	rule a -> b at position 10
.aaacabbbbbbaaccaccaaccacca.
	rule a -> b at position 11
.aaacabbbbbbbaccaccaaccacca.
	rule a -> b at position 12
.aaacabbbbbbbbccaccaaccacca.