C11111211113313112113313331333133313331313222313113313232233121   >>    C1111121111331311211331333133313331333131322231311331323223312   <<    C11111211113313112113313331333133313331313222313113313232233123   >>      C11111211113313112113313331333133313331313222313113313232233122   >>