C11111211113313112113313331333133313133313232233133313113313331311331313231221   >>    C1111121111331311211331333133313331313331323223313331311331333131133131323122   <<    C11111211113313112113313331333133313133313232233133313113313331311331313231223   >>      C11111211113313112113313331333133313133313232233133313113313331311331313231222   >>