a-a a-b aaa aab aad aak aao aar aas ab- aba abb abd abk abo abr abs ad- ada adb add adk ado adr ads aka akb akd akk ako akr aks aoa aob aod aok aoo aor aos ar- ara arb ard ark aro arr ars as- asa asb asd ask aso asr ass baa bab bad bak bao bar bas bba bbb bbd bbk bbo bbr bbs bda bdb bdd bdk bdo bdr bds bka bkb bkk bko bkr bks boa bob bod bok boo bor bos bra brb brd brk bro brr brs bsa bsb bsd bsk bso bsr bss daa dab dad dak dao dar das dba dbb dbd dbk dbo dbr dbs dda ddb ddd ddk ddo ddr dds dka dkb dkk dko dkr dks doa dob dod dok doo dor dos dra drb drd drk dro drr drs dsa dsb dsd dsk dso dsr dss ka- kaa kab kad kak kao kar kas kba kbb kbd kbk kbo kbr kbs kda kdb kdk kdo kdr kds kkb kkk kkr kks koa kob kod kok koo kor kos kra krd krk kro krr krs ksa ksb ksd ksk kso ksr kss oaa oab oad oak oao oar oas ob- oba obb obd obk obo obr obs oda odb odd odo odr ods oka okb okd okk oko okr oks oo- ooa oob ood ook ooo oor oos or- ora orb ord ork oro orr ors os- osa osb osd osk oso osr oss ra- raa rab rad rak rao rar ras rba rbb rbd rbk rbo rbr rbs rda rdb rdd rdo rdr rds rkb rkk rko rks roa rob rod rok roo ror ros rra rrb rrd rrk rrr rrs rsa rsb rsd rsk rso rsr rss saa sab sad sak sao sar sas sba sbb sbd sbk sbo sbr sbs sda sdb sdd sdk sdo sdr sds sk- ska skb skd skk sko skr sks soa sob sod sok soo sor sos sr- sra srb srd srk sro srr srs ss- ssa ssb ssd ssk sso ssr sss

a-ak a-do a-ok aaaa aaab aaad aaar aaas aaba aabb aabd aada aads aaka aaoo aara aard aaro aars aasa aasd aass abaa abab abad abak abar abas abb- abba abbb abbo abbr abbs abda abdo aboa abob abod abok aboo abor abos abra abro abrs abs- absa absd abss adaa adab adad adak adao adar adas adba adda addd addo addr adds adob adod adok adoo ador ados adra adro adrs adsa adso adsr adss akaa akao akar akas akka akko akok akos akr- akra aksa aoba aoks aora aorb aors aosd aoss arab arad arak arar aras arba arbs arda ardo ards arka arko arks aroa arob arod aroo aror aros arr- arra arrk arro arrr arrs ars- arsa arsd arsk arso asaa asab asad asak asao asar asas asba asbo asda asdo asds aska asko askr asks asob asod asok asor asos asra asro asrs assa assd assk asso assr asss baaa baad baak baar baas baba babb babo babr babs bada badb badd bado badr bads bak- baka bako bakr baks baos bar- bara barb bard bark baro barr bars basa bask baso bass bbad bbas bbbb bbbs bbdd bbdo bd-r bdos bdsd boab boad boak boar boas boba bobb bobo bobs boda bodb bodo bods boka boko boks boob bood book boor boos bor- bora bord bork boro borr bors bosa bosk boso boss brab brad brak brao bras brda brdo brds brka brkb broa brob brod brok broo bror bros brrr brrs brsb brsr bsaa bsas bsbd bsod bsos bsra bsrd bssd d-bo daab daad daar daas daba dabb dabo dabs dada dado dads daka dako daks daos dara darb dard dark daro darr dars dasa dasb dasd dask dass dbar dbas dbos dbrs dbsa dbss dddd ddss dkba doab doak doar doas doba dobb dobs dod- doda dodd dodo dods doka doko doob dood dook door doos dora dord dork doro dorr dors dosa dosk doso doss draa drab drad drak drar dras drba drda drob drod drra drrs drsa dsba dsda dsdr dsoa dsos dsrr dssa k-os kaaa kaab kaak kaar kaas kaba kabb kabd kabo kabr kad- kada kadd kado kadr kads kaka kakk kako kaks kaoa kaok kaor kaos kara karb kard kark karo karr kars kas- kasa kasb kask kaso kasr kass kbaa kbab kbad kbak kbar kbas kbba kbbb kbbd kbbk kbbo kbbr kbbs kbdb kbdo kbdr kbds kbkb kbkk kbko kbkr kboa kbob kbod kbok kboo kbos kbra kbrb kbrd kbrk kbro kbsa kbsb kbsk kbso kbsr kbss kdaa kdab kdad kdak kdao kdar kdbb kdbr kdbs kddb kddd kddk kddr kdka kdkb kdkd kdkk kdko kdkr kdok kdrb kdro kdrs kdsd kdsk kdsr kdss kkaa kkar kkba kkbb kkbd kkbo kkbr kkbs kkda kkdd kkdo kkkk kkoa kkob kkoo kkor kkrb kkrk kkro kkrr kkrs kksa kksd kksr kkss koab koak koar koas koba kobb kobk kobo kobr kobs koda kodk kodo kods koka kokb kokk koko kokr koks koob kook kooo koor koos kora korb kord kork koro korr kors kos- kosa kosb kosd koso kosr koss krab krad krak krar kras krba krbb krbd krbk krbr krda krdd krdo krdr krds krka krkd krkk krko krkr krks kroa krob krod krok kroo kror kros krrb krrk krro krrr krrs krsa krsd krsk krsr krss ksab ksak ksar ksas ksba ksbr ksbs ksdk ksdr ksds kska kskb kskd kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksra ksrb ksro ksrr ksrs kssa ksso kssr ksss oaks oara oars oass obad obak obas obba obbo obkb obok obor obos obra obro obsd obsr obss odas odbo odda oddd odds odoo odor odos odra odso okak okas okka okko okok okor okra okro oksa okso ooaa ooak ooba ooda oooo ooos oora oord oosa orab orad orak orao orar oras orba orbb orbo orbs orda ordo ords orka orko oro- orok oror oros orra orro orrs orsa orsk orso osak osar