C1111233131211111211113313331333133313331312331333133313121122211233131   >>    C111123313121111121111331333133313331333131233133313331312112221123313   <<    C1111233131211111211113313331333133313331312331333133313121122211233133   >>      C1111233131211111211113313331333133313331312331333133313121122211233132   >>