C313212111133131211331333133313331333133313231333133313331333133313112233231211   >>    C31321211113313121133133313331333133313331323133313331333133313331311223323121   <<    C313212111133131211331333133313331333133313231333133313331333133313112233231213   >>      C313212111133131211331333133313331333133313231333133313331333133313112233231212   >>