Loop of length 16 starting with a string of length 11
found after enumerating 433586 derivations:

.aabc.abccbcc
	rule aabc -> ccaaaa at position 0
.ccaaaa.abccbcc
	rule a -> b at position 4
.ccaaba.abccbcc
	rule aabc -> ccaaaa at position 5
.ccaabccaaaa.cbcc
	rule aabc -> ccaaaa at position 2
.ccccaaaacaaaa.cbcc
	rule a -> b at position 7
.ccccaaabcaaaa.cbcc
	rule aabc -> ccaaaa at position 5
.ccccaccaaaaaaaa.cbcc
	rule a -> b at position 11
.ccccaccaaaabaaa.cbcc
	rule a -> b at position 14
.ccccaccaaaabaab.cbcc
	rule aabc -> ccaaaa at position 12
.ccccaccaaaabccaaaa.bcc
	rule aabc -> ccaaaa at position 9
.ccccaccaaccaaaacaaaa.bcc
	rule a -> b at position 14
.ccccaccaaccaaabcaaaa.bcc
	rule a -> b at position 17
.ccccaccaaccaaabcabaa.bcc
	rule aabc -> ccaaaa at position 18
.ccccaccaaccaaabcabccaaaa.c
	rule a -> b at position 20
.ccccaccaaccaaabcabccbaaa.c
	rule a -> b at position 23
.ccccaccaaccaaabcabccbaab.c
	rule aabc -> ccaaaa at position 21
.ccccaccaaccaaabcabccbccaaaa.