C11111211113313112113313331333133313133313232233132313232233133323121   >>    C1111121111331311211331333133313331313331323223313231323223313332312   <<    C11111211113313112113313331333133313133313232233132313232233133323123   >>      C11111211113313112113313331333133313133313232233132313232233133323122   >>