a-a a-b a-i aaa aab aai aak aan aao aar aav ab- aba abb abi abk abn abo abr abv ai- aia aib aii aik ain aio air aiv aka akb aki akk akn ako akr akv an- ana anb ani ank ann ano anr anv aoa aob aoi aok aon aoo aor aov ar- ara arb ari ark arn aro arr arv av- ava avb avi avk avn avo avr baa bab bai bak ban bao bar bav bba bbb bbi bbk bbn bbo bbr bi- bia bib bii bik bin bio bir biv bka bkb bkk bkn bko bkr bkv bna bnb bni bnk bnn bno bnr bnv boa bob boi bok bon boo bor bov bra brb bri brk brn bro brr brv bva bvb bvi bvk bvn bvo bvr bvv i-v ia- iaa iab iai ian iao iar iav iba ibb ibi ibk ibn ibo ibr ibv iia iib iii iin iio iir ika ikb iki ikk iko ikr ikv in- ina inb ini ink inn ino inr inv io- ioa iob ioi ion ioo ior iov ir- ira irb iri irk irn iro irr irv iva ivb ivi ivo ivr ivv ka- kaa kab kai kak kan kao kar kav kba kbb kbi kbk kbn kbo kbr kia kib kii kik kin kio kir kiv kkb kki kkk kkn kkr kkv kn- kna kni knk knn kno knr koa kob koi kok kon koo kor kra kri krk krn kro krr krv kva kvb kvi kvk kvn kvo kvr kvv n-i naa nab nai nak nan nao nar nav nba nbb nbi nbk nbn nbo nbr nbv nia nib nii nik nin nio nir niv nka nki nkk nkn nko nkr nna nnb nni nnk nnn nno nnv no- noa nob noi nok non noo nor nov nra nrb nri nrk nrn nro nrr nrv nva nvb nvi nvk nvn nvv o-i oaa oab oai oak oan oao oar oav ob- oba obb obi obk obn obo obr obv oia oib oii oik oin oio oir oiv oka okb oki okk oko okr on- ona onb oni onk onn ono onr oo- ooa oob ooi ook oon ooo oor oov or- ora orb ori ork orn oro orr orv ov- ova ovb ovi ovo ovv ra- raa rab rai rak ran rao rar rav rba rbb rbi rbk rbn rbo rbr ria rib rii rik rin rio rir riv rkb rkk rko rkv rna rnb rni rnn rno rnr rnv roa rob roi rok ron roo ror rov rra rrb rri rrk rrn rrr rva rvb rvi rvn rvo rvr rvv v-a vaa vab vai vak van vao var vav vba vbi vbk vbo vbr vbv vi- via vib vii vik vin vio vir viv vka vkb vn- vna vni vno vnr vnv voa vob voi vok von voo vor vov vra vrb vri vrk vrn vrr vva vvb vvi vvo vvr vvv