a-a aaa aaf aan aao aap aas af- afa aff afn afo afp afs an- ana anf ann ano anp ans aoa aof aon aoo aop aos ap- apa apf apn apo app aps as- asa asf asn aso asp ass faa faf fan fao fap fas ffa fff ffn ffo ffp ffs fna fnf fnn fnp fns foa fof fon foo fop fos fpa fpn fpo fpp fps fsa fsf fsn fso fsp fss naa naf nan nao nap nas nfa nff nfn nfo nfp nfs nna nnf nnn nno nnp nns no- noa nof non noo nop nos npa npf npn npo npp nps nsa nsf nsn nso nsp nss oaa oaf oan oao oap oas of- ofa off ofn ofo ofp ofs on- ona onf onn ono onp ons oo- ooa oof oon ooo oop oos op- opa opf opn opo opp ops os- osa osf osn oso osp oss p-p paa paf pan pao pap pas pfa pff pfn pfo pfp pfs pn- pna pnf pnn pno pnp pns poa pof pon poo pop pos ppa ppf ppn ppo ppp pps ps- psa psf psn pso psp pss saa saf san sao sap sas sfa sff sfn sfo sfp sfs sna snf snn sno snp sns soa sof son soo sop sos spa spf spn spo spp sps ss- ssa ssf ssn sso ssp sss