a-a a-b aaa aab aad aag aak aan aao aar aas ab- aba abb abd abg abk abn abo abr abs ad- ada adb add adg adk adn ado adr ads ag- aga agb agd agg agk agn ago agr ags aka akb akd akg akk akn ako akr aks an- ana anb and ang ank ann ano anr ans aoa aob aod aog aok aon aoo aor aos ar- ara arb ard arg ark arn aro arr ars as- asa asb asd asg ask asn aso asr ass baa bab bad bag bak ban bao bar bas bba bbb bbd bbg bbk bbn bbo bbr bbs bda bdb bdd bdg bdk bdo bdr bds bga bgb bgd bgg bgk bgn bgo bgr bgs bka bkb bkg bkk bkn bko bkr bks bna bnb bnd bng bnk bnn bno bnr bns boa bob bod bog bok bon boo bor bos bra brb brd brg brk brn bro brr brs bsa bsb bsd bsg bsk bsn bso bsr bss daa dab dad dag dak dan dao dar das dba dbb dbd dbg dbk dbn dbo dbr dbs dda ddb ddd ddg ddk ddn ddo ddr dds dga dgd dgg dgk dgn dgr dgs dka dkb dkg dkk dko dkr dks dna dnb dnd dng dnk dnn dno dnr dns doa dob dod dog dok don doo dor dos dra drb drd drg drk drn dro drr drs dsa dsb dsd dsg dsk dsn dso dsr dss g-d gaa gab gad gag gak gan gao gar gas gba gbd gbg gbk gbn gbo gbr gbs gda gdb gdd gdk gdn gdo gdr gds gga ggb ggd ggg ggn ggo ggr ggs gka gkb gkd gkn gko gks gna gnb gnd gnn gno gnr gns goa gob god gog gok gon goo gor gos gra grb grd grg grk grn gro grr grs gsa gsb gsd gsg gsk gsn gso gsr gss ka- kaa kab kad kag kak kan kao kar kas kba kbb kbd kbk kbn kbo kbr kbs kda kdb kdg kdk kdo kdr kds kga kgb kgd kgo kgs kkb kkk kkn kkr kks kn- kna knd kng knk knn kno knr koa kob kod kog kok kon koo kor kos kra krd krg krk krn kro krr krs ksa ksb ksd ksg ksk ksn kso ksr kss naa nab nad nag nak nan nao nar nas nba nbb nbd nbg nbk nbn nbo nbr nbs nda ndb ndd ndg ndk ndn ndo ndr nds nga ngb ngd ngg ngk ngn ngo ngs nka nkk nkn nko nkr nks nna nnb nng nnk nnn nno nns no- noa nob nod nog nok non noo nor nos nra nrb nrd nrg nrk nrn nro nrr nrs nsa nsb nsd nsg nsk nsn nso nsr nss oaa oab oad oag oak oan oao oar oas ob- oba obb obd obg obk obn obo obr obs oda odb odd odg odn odo odr ods oga ogd ogg ogn ogo ogs oka okb okd okg okk oko okr oks on- ona onb ond ong onk onn ono onr ons oo- ooa oob ood oog ook oon ooo oor oos or- ora orb ord org ork orn oro orr ors os- osa osb osd osg osk osn oso osr oss ra- raa rab rad rag rak ran rao rar ras rba rbb rbd rbg rbk rbn rbo rbr rbs rda rdb rdd rdg rdn rdo rdr rds rga rgb rgd rgg rgk rgn rgo rgr rgs rkb rkg rkk rko rks rna rnb rnd rng rnn rno rnr rns roa rob rod rog rok ron roo ror ros rra rrb rrd rrg rrk rrn rrr rrs rsa rsb rsd rsg rsk rsn rso rsr rss saa sab sad sag sak san sao sar sas sba sbb sbd sbg sbk sbn sbo sbr sbs sda sdb sdd sdg sdk sdn sdo sdr sds sga sgb sgd sgg sgk sgn sgo sgr sgs sk- ska skb skd skg skk sko skr sks sna snb snd sng snk snn sno snr sns soa sob sod sog sok son soo sor sos sr- sra srb srd srg srk srn sro srr srs ss- ssa ssb ssd ssg ssk ssn sso ssr sss