Loop of length 26 starting with a string of length 8
found after enumerating 34077 derivations:

.ca.aaaaaa
	rule ca -> aabc at position 0
.aabc.aaaaaa
	rule ca -> aabc at position 3
.aabaabc.aaaaa
	rule a ->  at position 3
.aababc.aaaaa
	rule a ->  at position 3
.aabbc.aaaaa
	rule ca -> aabc at position 4
.aabbaabc.aaaa
	rule a ->  at position 4
.aabbabc.aaaa
	rule a ->  at position 4
.aabbbc.aaaa
	rule bbb -> ca at position 2
.aacac.aaaa
	rule ca -> aabc at position 4
.aacaaabc.aaa
	rule ca -> aabc at position 7
.aacaaabaabc.aa
	rule a ->  at position 7
.aacaaababc.aa
	rule a ->  at position 7
.aacaaabbc.aa
	rule ca -> aabc at position 8
.aacaaabbaabc.a
	rule a ->  at position 8
.aacaaabbabc.a
	rule a ->  at position 8
.aacaaabbbc.a
	rule bbb -> ca at position 6
.aacaaacac.a
	rule ca -> aabc at position 6
.aacaaaaabcc.a
	rule ca -> aabc at position 10
.aacaaaaabcaabc.
	rule ca -> aabc at position 9
.aacaaaaabaabcabc.
	rule a ->  at position 9
.aacaaaaababcabc.
	rule a ->  at position 9
.aacaaaaabbcabc.
	rule ca -> aabc at position 10
.aacaaaaabbaabcbc.
	rule a ->  at position 10
.aacaaaaabbabcbc.
	rule a ->  at position 10
.aacaaaaabbbcbc.
	rule bbb -> ca at position 8
.aacaaaaacacbc.
	rule ca -> aabc at position 8
.aacaaaaaaabccbc.