a-a aaa aan aao aap aar aas an- ana ann ano anp anr ans aoa aon aoo aop aor aos ap- apa apn apo app apr aps ar- ara arn aro arp arr ars as- asa asn aso asp asr ass naa nan nao nap nar nas nna nnn nno nnp nns no- noa non noo nop nor nos npa npn npo npp npr nps nra nrn nro nrp nrr nrs nsa nsn nso nsp nsr nss oaa oan oao oap oar oas on- ona onn ono onp onr ons oo- ooa oon ooo oop oor oos op- opa opn opo opp opr ops or- ora orn oro orp orr ors os- osa osn oso osp osr oss p-p paa pan pao pap par pas pn- pna pnn pno pnp pnr pns poa pon poo pop por pos ppa ppn ppo ppp ppr pps pra prn pro prp prr prs ps- psa psn pso psp psr pss ra- raa ran rao rap rar ras rna rnn rno rnp rnr rns roa ron roo rop ror ros rpa rpn rpo rpp rpr rps rra rrn rrp rrr rrs rsa rsn rso rsp rsr rss saa san sao sap sar sas sna snn sno snp snr sns soa son soo sop sor sos spa spn spo spp spr sps sr- sra srn sro srp srr srs ss- ssa ssn sso ssp ssr sss