C11111211113313112113313331333133313133313232233133321123121121   >>    C1111121111331311211331333133313331313331323223313332112312112   <<    C11111211113313112113313331333133313133313232233133321123121123   >>      C11111211113313112113313331333133313133313232233133321123121122   >>