Loop of length 6 starting with a string of length 6
found after enumerating 34 derivations:

.aaa.baa
	rule aaa -> bab at position 0
.bab.baa
	rule bab -> aba at position 0
.aba.baa
	rule bab -> aba at position 1
.aaba.aa
	rule aaa -> bab at position 3
.aabbab.
	rule bab -> aba at position 3
.aababa.
	rule bab -> aba at position 2
.aaabaa.