C1111233131211111211113313331333133313231313311211113313223232131121   >>    C111123313121111121111331333133313331323131331121111331322323213112   <<    C1111233131211111211113313331333133313231313311211113313223232131123   >>      C1111233131211111211113313331333133313231313311211113313223232131122   >>