C11111211113313112113313331333133313221333133313113313223313233231333131132211   >>    C1111121111331311211331333133313331322133313331311331322331323323133313113221   <<    C11111211113313112113313331333133313221333133313113313223313233231333131132213   >>      C11111211113313112113313331333133313221333133313113313223313233231333131132212   >>