Loop of length 27 starting with a string of length 15
found after enumerating 14077 derivations:

.aaaa.ababbababaa
	rule aaaa -> baba at position 0
.baba.ababbababaa
	rule baab -> aaba at position 2
.baaaba.abbababaa
	rule baab -> aaba at position 4
.baaaaaba.bababaa
	rule aaaa -> baba at position 1
.bbabaaba.bababaa
	rule baab -> aaba at position 3
.bbaaabaa.bababaa
	rule baab -> aaba at position 5
.bbaaaaaba.ababaa
	rule aaaa -> baba at position 2
.bbbabaaba.ababaa
	rule baab -> aaba at position 7
.bbbabaaaaba.abaa
	rule baab -> aaba at position 9
.bbbabaaaaaaba.aa
	rule aaaa -> baba at position 7
.bbbabaabababa.aa
	rule baab -> aaba at position 4
.bbbaaabaababa.aa
	rule baab -> aaba at position 6
.bbbaaaaabaaba.aa
	rule baab -> aaba at position 8
.bbbaaaaaaabaa.aa
	rule aaaa -> baba at position 5
.bbbaababaabaa.aa
	rule baab -> aaba at position 2
.bbaabaabaabaa.aa
	rule baab -> aaba at position 1
.baabaaabaabaa.aa
	rule baab -> aaba at position 0
.aabaaaabaabaa.aa
	rule baab -> aaba at position 7
.aabaaaaaabaaa.aa
	rule aaaa -> baba at position 5
.aabaabababaaa.aa
	rule baab -> aaba at position 2
.aaaabaababaaa.aa
	rule baab -> aaba at position 4
.aaaaaabaabaaa.aa
	rule baab -> aaba at position 6
.aaaaaaaabaaaa.aa
	rule aaaa -> baba at position 11
.aaaaaaaabaababa.
	rule baab -> aaba at position 8
.aaaaaaaaaabaaba.
	rule aaaa -> baba at position 5
.aaaaababaabaaba.
	rule baab -> aaba at position 10
.aaaaababaaaabaa.
	rule aaaa -> baba at position 8
.aaaaababbababaa.