a-a a-i aaa aaf aai aak aao aar aas af- afa aff afi afk afo afr afs ai- aia aif aii aik aio air ais aka aki akk ako akr aks aoa aof aoi aok aoo aor aos ar- ara arf ari ark aro arr ars as- asa asf asi ask aso asr ass faa faf fai fak fao far fas ffa fff ffi ffk ffo ffr ffs fia fif fii fik fir fis fka fkf fki fkk foa fof foi fok foo for fos fra frf fri frk fro frr frs fsa fsf fsi fsk fso fsr fss i-f ia- iaa iaf iai iao iar ias ifa iff ifi ifo ifr ifs iia iif iii iio iir iis ika ikf iki ikk iko ikr iks io- ioa iof ioi ioo ior ios ir- ira irf iri irk iro irr irs is- isa isf isi isk iso isr iss ka- kaa kaf kai kak kao kar kas kfa kff kfi kfo kfs kia kif kii kik kio kir kis kki kkk kkr kks koa kof koi kok koo kor kos kra krf kri krk kro krr krs ksa ksf ksi ksk kso ksr kss o-i oaa oaf oai oak oao oar oas of- ofa off ofi ofo ofr ofs oia oif oii oik oio oir ois oka oki okk oko okr oks oo- ooa oof ooi ook ooo oor oos or- ora orf ori ork oro orr ors os- osa osf osi osk oso osr oss ra- raa raf rai rak rao rar ras rfa rff rfi rfk rfo rfr rfs ria rif rii rik rio rir ris rkf rkk rko rks roa rof roi rok roo ror ros rra rrf rri rrk rrr rrs rsa rsf rsi rsk rso rsr rss saa saf sai sak sao sar sas sfa sff sfi sfk sfo sfr sfs sia sif sii sik sio sir sis sk- ska skf ski skk sko skr sks soa sof soi sok soo sor sos sr- sra srf sri srk sro srr srs ss- ssa ssf ssi ssk sso ssr sss