C11111211113313112113313331333133313133313232233133313232233132313223212111   >>    C1111121111331311211331333133313331313331323223313331323223313231322321211   <<    C11111211113313112113313331333133313133313232233133313232233132313223212113   >>      C11111211113313112113313331333133313133313232233133313232233132313223212112   >>