a-a a-b aaa aab aad aak aan aar aas aau ab- aba abb abd abk abn abr abs abu ad- ada adb add adk adn adr ads adu aka akb akd akk akn akr aks aku an- ana anb and ank ann anr ans anu ar- ara arb ard ark arn arr ars aru as- asa asb asd ask asn asr ass asu au- aua aub aud auk aun aur aus b-u baa bab bad bak ban bar bas bau bba bbb bbd bbk bbn bbr bbs bbu bda bdb bdd bdk bdr bds bdu bka bkb bkk bkn bkr bks bna bnb bnd bnk bnn bnr bns bnu bra brb brd brk brn brr brs bru bsa bsb bsd bsk bsn bsr bss bsu bua bub bud buk bun bur bus buu daa dab dad dak dan dar das dau dba dbb dbd dbk dbn dbr dbs dbu dda ddb ddd ddk ddn ddr dds ddu dka dkb dkk dkr dks dku dna dnb dnd dnk dnn dnr dns dra drb drd drk drn drr drs dru dsa dsb dsd dsk dsn dsr dss dsu dua dub dud duk dun dur dus ka- kaa kab kad kak kan kar kas kau kba kbb kbd kbk kbn kbr kbs kbu kda kdb kdk kdr kds kdu kkb kkk kkn kkr kks kku kn- kna knd knk knn knr knu kra krd krk krn krr krs kru ksa ksb ksd ksk ksn ksr kss ksu kub kud kuk kun kur kus kuu naa nab nad nak nan nar nas nau nba nbb nbd nbk nbn nbr nbs nbu nda ndb ndd ndk ndn ndr nds ndu nka nkk nkn nkr nks nku nna nnb nnk nnn nns nnu nra nrb nrd nrk nrn nrr nrs nru nsa nsb nsd nsk nsn nsr nss nsu nua nub nud nuk nun nur nus nuu ra- raa rab rad rak ran rar ras rau rba rbb rbd rbk rbn rbr rbs rbu rda rdb rdd rdn rdr rds rdu rkb rkk rks rku rna rnb rnd rnn rnr rns rnu rra rrb rrd rrk rrn rrr rrs rru rsa rsb rsd rsk rsn rsr rss rsu rua rub rud ruk run rur rus ruu saa sab sad sak san sar sas sau sba sbb sbd sbk sbn sbr sbs sbu sda sdb sdd sdk sdn sdr sds sdu sk- ska skb skd skk skr sks sku sna snb snd snk snn snr sns snu sr- sra srb srd srk srn srr srs ss- ssa ssb ssd ssk ssn ssr sss ssu sua sub sud suk sun sur sus suu ua- uaa uab uad uak uan uar uas uau uba ubb ubk ubn ubr ubs ubu uda udb udd udk udn udr uds udu uka ukb ukk ukn ukr uku un- una unb und unk unn unr uns unu ur- ura urb urd urk urn urr urs uru usa usb usd usk usn usr uss usu uua uun uur uus uuu