Loop of length 20 starting with a string of length 11
found after enumerating 36882 derivations:

.abbc.bbccbcc
	rule abbc -> bccaaa at position 0
.bccaaa.bbccbcc
	rule a -> b at position 4
.bccaba.bbccbcc
	rule abbc -> bccaaa at position 5
.bccabbccaaa.cbcc
	rule abbc -> bccaaa at position 3
.bccbccaaacaaa.cbcc
	rule a -> b at position 7
.bccbccabacaaa.cbcc
	rule a -> b at position 8
.bccbccabbcaaa.cbcc
	rule abbc -> bccaaa at position 6
.bccbccbccaaaaaa.cbcc
	rule a -> b at position 11
.bccbccbccaabaaa.cbcc
	rule a -> b at position 13
.bccbccbccaababa.cbcc
	rule a -> b at position 14
.bccbccbccaababb.cbcc
	rule abbc -> bccaaa at position 12
.bccbccbccaabbccaaa.bcc
	rule abbc -> bccaaa at position 10
.bccbccbccabccaaacaaa.bcc
	rule a -> b at position 14
.bccbccbccabccabacaaa.bcc
	rule a -> b at position 15
.bccbccbccabccabbcaaa.bcc
	rule a -> b at position 17
.bccbccbccabccabbcbaa.bcc
	rule a -> b at position 19
.bccbccbccabccabbcbab.bcc
	rule abbc -> bccaaa at position 18
.bccbccbccabccabbcbbccaaa.c
	rule a -> b at position 22
.bccbccbccabccabbcbbccaba.c
	rule a -> b at position 23
.bccbccbccabccabbcbbccabb.c
	rule abbc -> bccaaa at position 21
.bccbccbccabccabbcbbccbccaaa.