a-a a-b a-i a-t aaa aab aai aat aav ab- aba abb abi abt abv ai- aia aib aii ait aiv at- ata atb ati att atv av- ava avb avi avt baa bab bai bat bav bba bbb bbi bbt bi- bia bib bii bit biv bta btb bti btt btv bva bvb bvi bvt bvv i-v ia- iaa iab iai iat iav iba ibb ibi ibt ibv iia iib iii iit ita itb iti itt itv iva ivb ivi ivt ivv taa tab tai tat tav tba tbb tbi tbt tbv tia tib tii tit tiv tta ttb tti ttt ttv tva tvb tvi tvt v-a vaa vab vai vat vav vba vbi vbv vi- via vib vii vit viv vta vtb vti vtt vtv vva vvb vvi vvt vvv