a-a a-b a-i a-t aaa aab aai aan aao aat aav ab- aba abb abi abn abo abt abv ai- aia aib aii ain aio ait aiv an- ana anb ani ann ano ant anv aoa aob aoi aon aoo aot aov at- ata atb ati atn ato att atv av- ava avb avi avn avo avt baa bab bai ban bao bat bav bba bbb bbi bbn bbo bbt bi- bia bib bii bin bio bit biv bna bnb bni bnn bno bnt bnv boa bob boi bon boo bot bov bta btb bti btn bto btt btv bva bvb bvi bvn bvo bvt bvv i-v ia- iaa iab iai ian iao iat iav iba ibb ibi ibn ibo ibt ibv iia iib iii iin iio iit in- ina inb ini inn ino int inv io- ioa iob ioi ion ioo iot iov ita itb iti itn ito itt itv iva ivb ivi ivo ivt ivv n-i naa nab nai nan nao nat nav nba nbb nbi nbn nbo nbt nbv nia nib nii nin nio nit niv nna nnb nni nnn nno nnt nnv no- noa nob noi non noo not nov nta ntb nti ntn nto ntt ntv nva nvb nvi nvn nvt nvv o-i oaa oab oai oan oao oat oav ob- oba obb obi obn obo obt obv oia oib oii oin oio oit oiv on- ona onb oni onn ono ont oo- ooa oob ooi oon ooo oot oov ot- ota otb oti otn oto ott otv ov- ova ovb ovi ovo ovv taa tab tai tan tao tat tav tba tbb tbi tbn tbo tbt tbv tia tib tii tin tio tit tiv tna tnb tni tnn tno tnt to- toa tob toi ton too tot tov tta ttb tti ttn tto ttt ttv tva tvb tvi tvn tvo tvt v-a vaa vab vai van vao vat vav vba vbi vbo vbv vi- via vib vii vin vio vit viv vn- vna vni vno vnv voa vob voi von voo vot vov vta vtb vti vto vtt vtv vva vvb vvi vvo vvt vvv