a-a a-b a-i aaa aab aad aai aak aao aar aas ab- aba abb abd abi abk abo abr abs ad- ada adb add adi adk ado adr ads ai- aia aib aid aii aik aio air ais aka akb akd aki akk ako akr aks aoa aob aod aoi aok aoo aor aos ar- ara arb ard ari ark aro arr ars as- asa asb asd asi ask aso asr ass baa bab bad bai bak bao bar bas bba bbb bbd bbi bbk bbo bbr bbs bda bdb bdd bdi bdk bdo bdr bds bi- bia bib bid bii bik bio bir bis bka bkb bkk bko bkr bks boa bob bod boi bok boo bor bos bra brb brd bri brk bro brr brs bsa bsb bsd bsi bsk bso bsr bss daa dab dad dai dak dao dar das dba dbb dbd dbi dbk dbo dbr dbs dda ddb ddd ddi ddk ddo ddr dds di- dia dib did dii dik dio dir dis dka dkb dki dkk dko dkr dks doa dob dod doi dok doo dor dos dra drb drd dri drk dro drr drs dsa dsb dsd dsi dsk dso dsr dss i-d ia- iaa iab iad iai iao iar ias iba ibb ibd ibi ibk ibo ibr ibs ida idb idd idi idk ido idr ids iia iib iid iii iio iir iis ika ikb iki ikk iko ikr iks io- ioa iob iod ioi ioo ior ios ir- ira irb ird iri irk iro irr irs is- isa isb isd isi isk iso isr iss ka- kaa kab kad kai kak kao kar kas kba kbb kbd kbi kbk kbo kbr kbs kda kdb kdk kdo kdr kds kia kib kid kii kik kio kir kis kkb kki kkk kkr kks koa kob kod koi kok koo kor kos kra krd kri krk kro krr krs ksa ksb ksd ksi ksk kso ksr kss o-i oaa oab oad oai oak oao oar oas ob- oba obb obd obi obk obo obr obs oda odb odd odi odo odr ods oia oib oid oii oik oio oir ois oka okb okd oki okk oko okr oks oo- ooa oob ood ooi ook ooo oor oos or- ora orb ord ori ork oro orr ors os- osa osb osd osi osk oso osr oss ra- raa rab rad rai rak rao rar ras rba rbb rbd rbi rbk rbo rbr rbs rda rdb rdd rdi rdo rdr rds ria rib rid rii rik rio rir ris rkb rkk rko rks roa rob rod roi rok roo ror ros rra rrb rrd rri rrk rrr rrs rsa rsb rsd rsi rsk rso rsr rss saa sab sad sai sak sao sar sas sba sbb sbd sbi sbk sbo sbr sbs sda sdb sdd sdi sdk sdo sdr sds sia sib sid sii sik sio sir sis sk- ska skb skd ski skk sko skr sks soa sob sod soi sok soo sor sos sr- sra srb srd sri srk sro srr srs ss- ssa ssb ssd ssi ssk sso ssr sss