C11111211113313112113313331333133313221333133313113313231232221   >>    C1111121111331311211331333133313331322133313331311331323123222   <<    C11111211113313112113313331333133313221333133313113313231232223   >>      C11111211113313112113313331333133313221333133313113313231232222   >>