C1111133313331323223313331333133313233232212111133131133132212121   >>    C111113331333132322331333133313331323323221211113313113313221212   <<    C1111133313331323223313331333133313233232212111133131133132212123   >>      C1111133313331323223313331333133313233232212111133131133132212122   >>