C11111211113313112113313331333133313133313232233133313113313112211232232311   >>    C1111121111331311211331333133313331313331323223313331311331311221123223231   <<    C11111211113313112113313331333133313133313232233133313113313112211232232313   >>      C11111211113313112113313331333133313133313232233133313113313112211232232312   >>