C11111211113313112113313331333133313133313232233132233131133132213231211   >>    C1111121111331311211331333133313331313331323223313223313113313221323121   <<    C11111211113313112113313331333133313133313232233132233131133132213231213   >>      C11111211113313112113313331333133313133313232233132233131133132213231212   >>