AABABAAAABBBBBABABBAABBABABBABAAAABBABBBBAABBBABABBBAAABBBABABABBAABAABABABABABBBAAABAAABBBBABBBBAB? AAABABAAAABBBBBABABBAABBABABBABAAAABBABBBBAABBBABABBBAAABBBABABABBAABAABABABABABBBAAABAAABBBBABBBBAB AAABABAAAABBBBBABABBAABBABABBABAAAABBABBBBAABBBABABBBAAABBBABABABBAABAABABABABABBBAAABAAABBBBABBBBAB 1 2 2 AAABABAAAABBBBBABABBAABBABABBABAAAABBABBBBAABBBABABBBAAABBBABABABBAABAABABABABABBBAAABAAABBBBABBBBAB