a-a a-b a-i a-t aaa aab aai aao aat aav ab- aba abb abi abo abt abv ai- aia aib aii aio ait aiv aoa aob aoi aoo aot aov at- ata atb ati ato att atv av- ava avb avi avo avt baa bab bai bao bat bav bba bbb bbi bbo bbt bi- bia bib bii bio bit biv boa bob boi boo bot bov bta btb bti bto btt btv bva bvb bvi bvo bvt bvv i-v ia- iaa iab iai iao iat iav iba ibb ibi ibo ibt ibv iia iib iii iio iit io- ioa iob ioi ioo iot iov ita itb iti ito itt itv iva ivb ivi ivo ivt ivv o-i oaa oab oai oao oat oav ob- oba obb obi obo obt obv oia oib oii oio oit oiv oo- ooa oob ooi ooo oot oov ot- ota otb oti oto ott otv ov- ova ovb ovi ovo ovv taa tab tai tao tat tav tba tbb tbi tbo tbt tbv tia tib tii tio tit tiv to- toa tob toi too tot tov tta ttb tti tto ttt ttv tva tvb tvi tvo tvt v-a vaa vab vai vao vat vav vba vbi vbo vbv vi- via vib vii vio vit viv voa vob voi voo vot vov vta vtb vti vto vtt vtv vva vvb vvi vvo vvt vvv