C313212111133131211331333133313331311331333133313113313331322133313232212121   >>    C31321211113313121133133313331333131133133313331311331333132213331323221212   <<    C313212111133131211331333133313331311331333133313113313331322133313232212123   >>      C313212111133131211331333133313331311331333133313113313331322133313232212122   >>