a-a a-b a-i aaa aab aai aak aan aao aar aau ab- aba abb abi abk abn abo abr abu ai- aia aib aii aik ain aio air aiu aka akb aki akk akn ako akr aku an- ana anb ani ank ann ano anr anu aoa aob aoi aok aon aoo aor aou ar- ara arb ari ark arn aro arr aru au- aua aub aui auk aun auo aur b-u baa bab bai bak ban bao bar bau bba bbb bbi bbk bbn bbo bbr bbu bi- bia bib bii bik bin bio bir biu bka bkb bkk bkn bko bkr bna bnb bni bnk bnn bno bnr bnu boa bob boi bok bon boo bor bou bra brb bri brk brn bro brr bru bua bub bui buk bun buo bur buu ia- iaa iab iai ian iao iar iau iba ibb ibi ibk ibn ibo ibr ibu iia iib iii iin iio iir iiu ika ikb iki ikk iko ikr iku in- ina inb ini ink inn ino inr inu io- ioa iob ioi ion ioo ior iou ir- ira irb iri irk irn iro irr iru iu- iua iub iui iur ka- kaa kab kai kak kan kao kar kau kba kbb kbi kbk kbn kbo kbr kbu kia kib kii kik kin kio kir kiu kkb kki kkk kkn kkr kku kn- kna kni knk knn kno knr knu koa kob koi kok kon koo kor kou kra kri krk krn kro krr kru kub kui kuk kun kur kuu n-i naa nab nai nak nan nao nar nau nba nbb nbi nbk nbn nbo nbr nbu nia nib nii nik nin nio nir niu nka nki nkk nkn nko nkr nku nna nnb nni nnk nnn nno nnu no- noa nob noi nok non noo nor nou nra nrb nri nrk nrn nro nrr nru nua nub nui nuk nun nuo nur nuu o-i oaa oab oai oak oan oao oar oau ob- oba obb obi obk obn obo obr obu oia oib oii oik oin oio oir oiu oka okb oki okk oko okr oku on- ona onb oni onk onn ono onr onu oo- ooa oob ooi ook oon ooo oor or- ora orb ori ork orn oro orr oru ou- oua oui ouk oun ouo our ra- raa rab rai rak ran rao rar rau rba rbb rbi rbk rbn rbo rbr rbu ria rib rii rik rin rio rir rkb rkk rko rku rna rnb rni rnn rno rnr rnu roa rob roi rok ron roo ror rou rra rrb rri rrk rrn rrr rru rua rub rui ruk run ruo rur ruu ua- uaa uab uai uak uan uao uar uau uba ubb ubi ubk ubn ubo ubr ubu uia uib uii uin uio uir uiu uka ukb uki ukk ukn ukr uku un- una unb uni unk unn uno unr unu uoa uob uok uon uoo uor ur- ura urb uri urk urn uro urr uru uua uun uur uuu