Loop of length 26 starting with a string of length 10
found after enumerating 30323 derivations:

.cbbb.bbbbbb
	rule cbbb -> aabcca at position 0
.aabcca.bbbbbb
	rule a -> b at position 5
.aabccb.bbbbbb
	rule cbbb -> aabcca at position 4
.aabcaabcca.bbbb
	rule a -> b at position 4
.aabcbabcca.bbbb
	rule a -> b at position 5
.aabcbbbcca.bbbb
	rule a -> b at position 9
.aabcbbbccb.bbbb
	rule cbbb -> aabcca at position 8
.aabcbbbcaabcca.bb
	rule a -> b at position 8
.aabcbbbcbabcca.bb
	rule a -> b at position 9
.aabcbbbcbbbcca.bb
	rule cbbb -> aabcca at position 7
.aabcbbbaabccacca.bb
	rule a -> b at position 7
.aabcbbbbabccacca.bb
	rule a -> b at position 8
.aabcbbbbbbccacca.bb
	rule a -> b at position 12
.aabcbbbbbbccbcca.bb
	rule a -> b at position 15
.aabcbbbbbbccbccb.bb
	rule cbbb -> aabcca at position 14
.aabcbbbbbbccbcaabcca.
	rule a -> b at position 14
.aabcbbbbbbccbcbabcca.
	rule a -> b at position 15
.aabcbbbbbbccbcbbbcca.
	rule cbbb -> aabcca at position 13
.aabcbbbbbbccbaabccacca.
	rule a -> b at position 13
.aabcbbbbbbccbbabccacca.
	rule a -> b at position 14
.aabcbbbbbbccbbbbccacca.
	rule cbbb -> aabcca at position 11
.aabcbbbbbbcaabccabccacca.
	rule a -> b at position 11
.aabcbbbbbbcbabccabccacca.
	rule a -> b at position 12
.aabcbbbbbbcbbbccabccacca.
	rule cbbb -> aabcca at position 10
.aabcbbbbbbaabccaccabccacca.
	rule a -> b at position 10
.aabcbbbbbbbabccaccabccacca.
	rule a -> b at position 11
.aabcbbbbbbbbbccaccabccacca.