a-a aaa aaf aan aao aap aar aas af- afa aff afn afo afp afr afs an- ana anf ann ano anp anr ans aoa aof aon aoo aop aor aos ap- apa apf apn apo app apr aps ar- ara arf arn aro arp arr ars as- asa asf asn aso asp asr ass faa faf fan fao fap far fas ffa fff ffn ffo ffp ffr ffs fna fnf fnn fnp fnr fns foa fof fon foo fop for fos fpa fpn fpo fpp fpr fps fra frf frn fro frp frr frs fsa fsf fsn fso fsp fsr fss naa naf nan nao nap nar nas nfa nff nfn nfo nfp nfr nfs nna nnf nnn nno nnp nns no- noa nof non noo nop nor nos npa npf npn npo npp npr nps nra nrf nrn nro nrp nrr nrs nsa nsf nsn nso nsp nsr nss oaa oaf oan oao oap oar oas of- ofa off ofn ofo ofp ofr ofs on- ona onf onn ono onp onr ons oo- ooa oof oon ooo oop oor oos op- opa opf opn opo opp opr ops or- ora orf orn oro orp orr ors os- osa osf osn oso osp osr oss p-p paa paf pan pao pap par pas pfa pff pfn pfo pfp pfr pfs pn- pna pnf pnn pno pnp pnr pns poa pof pon poo pop por pos ppa ppf ppn ppo ppp ppr pps pra prf prn pro prp prr prs ps- psa psf psn pso psp psr pss ra- raa raf ran rao rap rar ras rfa rff rfn rfo rfp rfr rfs rna rnn rno rnp rnr rns roa rof ron roo rop ror ros rpa rpf rpn rpo rpp rpr rps rra rrf rrn rrp rrr rrs rsa rsf rsn rso rsp rsr rss saa saf san sao sap sar sas sfa sff sfn sfo sfp sfr sfs sna snf snn sno snp snr sns soa sof son soo sop sor sos spa spf spn spo spp spr sps sr- sra srf srn sro srp srr srs ss- ssa ssf ssn sso ssp ssr sss