C11111211113313112113313331333133313331333131211111133131133132233132211   >>    C1111121111331311211331333133313331333133313121111113313113313223313221   <<    C11111211113313112113313331333133313331333131211111133131133132233132213   >>      C11111211113313112113313331333133313331333131211111133131133132233132212   >>