C11111211113313112113313331333133313113121111331333133312111133133313232233211   >>    C1111121111331311211331333133313331311312111133133313331211113313331323223321   <<    C11111211113313112113313331333133313113121111331333133312111133133313232233213   >>      C11111211113313112113313331333133313113121111331333133312111133133313232233212   >>