C11111211113313112113313331333133313133313232233133313232111221   >>    C1111121111331311211331333133313331313331323223313331323211122   <<    C11111211113313112113313331333133313133313232233133313232111223   >>      C11111211113313112113313331333133313133313232233133313232111222   >>