C11111211113313112113313331333133313133313232233133112212323221   >>    C1111121111331311211331333133313331313331323223313311221232322   <<    C11111211113313112113313331333133313133313232233133112212323223   >>      C11111211113313112113313331333133313133313232233133112212323222   >>