C312312111133131121333133313113313331333133313331333112211232221   >>    C31231211113313112133313331311331333133313331333133311221123222   <<    C312312111133131121333133313113313331333133313331333112211232223   >>      C312312111133131121333133313113313331333133313331333112211232222   >>