a-a a-b aaa aab aad aak aan aao aas aau ab- aba abb abd abk abn abo abs abu ad- ada adb add adk adn ado ads adu aka akb akd akk akn ako aks aku an- ana anb and ank ann ano ans anu aoa aob aod aok aon aoo aos aou as- asa asb asd ask asn aso ass asu au- aua aub aud auk aun auo aus b-u baa bab bad bak ban bao bas bau bba bbb bbd bbk bbn bbo bbs bbu bda bdb bdd bdk bdo bds bdu bka bkb bkk bkn bko bks bna bnb bnd bnk bnn bno bns bnu boa bob bod bok bon boo bos bou bsa bsb bsd bsk bsn bso bss bsu bua bub bud buk bun buo bus buu daa dab dad dak dan dao das dau dba dbb dbd dbk dbn dbo dbs dbu dda ddb ddd ddk ddn ddo dds ddu dka dkb dkk dko dks dku dna dnb dnd dnk dnn dno dns doa dob dod dok don doo dos dou dsa dsb dsd dsk dsn dso dss dsu dua dub dud duk dun duo dus ka- kaa kab kad kak kan kao kas kau kba kbb kbd kbk kbn kbo kbs kbu kda kdb kdk kdo kds kdu kkb kkk kkn kks kku kn- kna knd knk knn kno knu koa kob kod kok kon koo kos kou ksa ksb ksd ksk ksn kso kss ksu kub kud kuk kun kus kuu naa nab nad nak nan nao nas nau nba nbb nbd nbk nbn nbo nbs nbu nda ndb ndd ndk ndn ndo nds ndu nka nkk nkn nko nks nku nna nnb nnk nnn nno nns nnu no- noa nob nod nok non noo nos nou nsa nsb nsd nsk nsn nso nss nsu nua nub nud nuk nun nuo nus nuu oaa oab oad oak oan oao oas oau ob- oba obb obd obk obn obo obs obu oda odb odd odn odo ods odu oka okb okd okk oko oks oku on- ona onb ond onk onn ono ons onu oo- ooa oob ood ook oon ooo oos os- osa osb osd osk osn oso oss osu ou- oua oud ouk oun ouo ous saa sab sad sak san sao sas sau sba sbb sbd sbk sbn sbo sbs sbu sda sdb sdd sdk sdn sdo sds sdu sk- ska skb skd skk sko sks sku sna snb snd snk snn sno sns snu soa sob sod sok son soo sos sou ss- ssa ssb ssd ssk ssn sso sss ssu sua sub sud suk sun suo sus suu ua- uaa uab uad uak uan uao uas uau uba ubb ubk ubn ubo ubs ubu uda udb udd udk udn udo uds udu uka ukb ukk ukn uku un- una unb und unk unn uno uns unu uoa uob uod uok uon uoo uos usa usb usd usk usn uso uss usu uua uun uus uuu