a-a a-b aaa aab aad aak aan aas aau ab- aba abb abd abk abn abs abu ad- ada adb add adk adn ads adu aka akb akd akk akn aks aku an- ana anb and ank ann ans anu as- asa asb asd ask asn ass asu au- aua aub aud auk aun aus b-u baa bab bad bak ban bas bau bba bbb bbd bbk bbn bbs bbu bda bdb bdd bdk bds bdu bka bkb bkk bkn bks bna bnb bnd bnk bnn bns bnu bsa bsb bsd bsk bsn bss bsu bua bub bud buk bun bus buu daa dab dad dak dan das dau dba dbb dbd dbk dbn dbs dbu dda ddb ddd ddk ddn dds ddu dka dkb dkk dks dku dna dnb dnd dnk dnn dns dsa dsb dsd dsk dsn dss dsu dua dub dud duk dun dus ka- kaa kab kad kak kan kas kau kba kbb kbd kbk kbn kbs kbu kda kdb kdk kds kdu kkb kkk kkn kks kku kn- kna knd knk knn knu ksa ksb ksd ksk ksn kss ksu kub kud kuk kun kus kuu naa nab nad nak nan nas nau nba nbb nbd nbk nbn nbs nbu nda ndb ndd ndk ndn nds ndu nka nkk nkn nks nku nna nnb nnk nnn nns nnu nsa nsb nsd nsk nsn nss nsu nua nub nud nuk nun nus nuu saa sab sad sak san sas sau sba sbb sbd sbk sbn sbs sbu sda sdb sdd sdk sdn sds sdu sk- ska skb skd skk sks sku sna snb snd snk snn sns snu ss- ssa ssb ssd ssk ssn sss ssu sua sub sud suk sun sus suu ua- uaa uab uad uak uan uas uau uba ubb ubk ubn ubs ubu uda udb udd udk udn uds udu uka ukb ukk ukn uku un- una unb und unk unn uns unu usa usb usd usk usn uss usu uua uun uus uuu