a-a a-b aaa aab aak aan aar aas aau ab- aba abb abk abn abr abs abu aka akb akk akn akr aks aku an- ana anb ank ann anr ans anu ar- ara arb ark arn arr ars aru as- asa asb ask asn asr ass asu au- aua aub auk aun aur aus b-u baa bab bak ban bar bas bau bba bbb bbk bbn bbr bbs bbu bka bkb bkk bkn bkr bks bna bnb bnk bnn bnr bns bnu bra brb brk brn brr brs bru bsa bsb bsk bsn bsr bss bsu bua bub buk bun bur bus buu ka- kaa kab kak kan kar kas kau kba kbb kbk kbn kbr kbs kbu kkb kkk kkn kkr kks kku kn- kna knk knn knr knu kra krk krn krr krs kru ksa ksb ksk ksn ksr kss ksu kub kuk kun kur kus kuu naa nab nak nan nar nas nau nba nbb nbk nbn nbr nbs nbu nka nkk nkn nkr nks nku nna nnb nnk nnn nns nnu nra nrb nrk nrn nrr nrs nru nsa nsb nsk nsn nsr nss nsu nua nub nuk nun nur nus nuu ra- raa rab rak ran rar ras rau rba rbb rbk rbn rbr rbs rbu rkb rkk rks rku rna rnb rnn rnr rns rnu rra rrb rrk rrn rrr rrs rru rsa rsb rsk rsn rsr rss rsu rua rub ruk run rur rus ruu saa sab sak san sar sas sau sba sbb sbk sbn sbr sbs sbu sk- ska skb skk skr sks sku sna snb snk snn snr sns snu sr- sra srb srk srn srr srs ss- ssa ssb ssk ssn ssr sss ssu sua sub suk sun sur sus suu ua- uaa uab uak uan uar uas uau uba ubb ubk ubn ubr ubs ubu uka ukb ukk ukn ukr uku un- una unb unk unn unr uns unu ur- ura urb urk urn urr urs uru usa usb usk usn usr uss usu uua uun uur uus uuu