C11111211113313112113313331333133313221333133313113313331322331333133313312121   >>    C1111121111331311211331333133313331322133313331311331333132233133313331331212   <<    C11111211113313112113313331333133313221333133313113313331322331333133313312123   >>      C11111211113313112113313331333133313221333133313113313331322331333133313312122   >>