C1111233131211111211113313331333133313211231211111333133313121123232321   >>    C111123313121111121111331333133313331321123121111133313331312112323232   <<    C1111233131211111211113313331333133313211231211111333133313121123232323   >>      C1111233131211111211113313331333133313211231211111333133313121123232322   >>