Loop of length 16 starting with a string of length 11
found after enumerating 31506 derivations:

.aa.acaaccacc
	rule aa -> b at position 0
.b.acaaccacc
	rule bac -> ccaaaa at position 0
.ccaaaa.aaccacc
	rule aa -> b at position 2
.ccbaa.aaccacc
	rule aa -> b at position 4
.ccbab.accacc
	rule bac -> ccaaaa at position 4
.ccbaccaaaa.cacc
	rule bac -> ccaaaa at position 2
.ccccaaaacaaaa.cacc
	rule aa -> b at position 5
.ccccabacaaaa.cacc
	rule bac -> ccaaaa at position 5
.ccccaccaaaaaaaa.cacc
	rule aa -> b at position 9
.ccccaccaabaaaa.cacc
	rule aa -> b at position 11
.ccccaccaababa.cacc
	rule bac -> ccaaaa at position 11
.ccccaccaabaccaaaa.acc
	rule bac -> ccaaaa at position 9
.ccccaccaaccaaaacaaaa.acc
	rule aa -> b at position 18
.ccccaccaaccaaaacaab.acc
	rule bac -> ccaaaa at position 18
.ccccaccaaccaaaacaaccaaaa.c
	rule aa -> b at position 21
.ccccaccaaccaaaacaaccaba.c
	rule bac -> ccaaaa at position 21
.ccccaccaaccaaaacaaccaccaaaa.