Loop of length 29 starting with a string of length 6
found after enumerating 41897 derivations:

.ac.cbcc
	rule ac -> cbaa at position 0
.cbaa.cbcc
	rule ac -> cbaa at position 3
.cbacbaa.bcc
	rule ac -> cbaa at position 2
.cbcbaabaa.bcc
	rule a ->  at position 4
.cbcbabaa.bcc
	rule a ->  at position 4
.cbcbbaa.bcc
	rule a ->  at position 5
.cbcbba.bcc
	rule a ->  at position 5
.cbcbb.bcc
	rule bb -> bca at position 4
.cbcbbca.cc
	rule bb -> bca at position 3
.cbcbcaca.cc
	rule ac -> cbaa at position 5
.cbcbccbaaa.cc
	rule ac -> cbaa at position 9
.cbcbccbaacbaa.c
	rule ac -> cbaa at position 8
.cbcbccbacbaabaa.c
	rule ac -> cbaa at position 7
.cbcbccbcbaabaabaa.c
	rule a ->  at position 9
.cbcbccbcbabaabaa.c
	rule a ->  at position 9
.cbcbccbcbbaabaa.c
	rule a ->  at position 10
.cbcbccbcbbabaa.c
	rule a ->  at position 10
.cbcbccbcbbbaa.c
	rule bb -> bca at position 9
.cbcbccbcbbcaaa.c
	rule bb -> bca at position 8
.cbcbccbcbcacaaa.c
	rule ac -> cbaa at position 14
.cbcbccbcbcacaacbaa.
	rule ac -> cbaa at position 13
.cbcbccbcbcacacbaabaa.
	rule ac -> cbaa at position 12
.cbcbccbcbcaccbaabaabaa.
	rule a ->  at position 14
.cbcbccbcbcaccbabaabaa.
	rule a ->  at position 14
.cbcbccbcbcaccbbaabaa.
	rule a ->  at position 15
.cbcbccbcbcaccbbabaa.
	rule a ->  at position 15
.cbcbccbcbcaccbbbaa.
	rule bb -> bca at position 14
.cbcbccbcbcaccbbcaaa.
	rule bb -> bca at position 13
.cbcbccbcbcaccbcacaaa.
	rule a ->  at position 15
.cbcbccbcbcaccbccaaa.