C11111211113313112113313331333133313331333131211111211113313331333223311212321   >>    C1111121111331311211331333133313331333133313121111121111331333133322331121232   <<    C11111211113313112113313331333133313331333131211111211113313331333223311212323   >>      C11111211113313112113313331333133313331333131211111211113313331333223311212322   >>