a-a a-b a-i a-t aaa aab aai aao aar aat aav ab- aba abb abi abo abr abt abv ai- aia aib aii aio air ait aiv aoa aob aoi aoo aor aot aov ar- ara arb ari aro arr art arv at- ata atb ati ato atr att atv av- ava avb avi avo avr avt baa bab bai bao bar bat bav bba bbb bbi bbo bbr bbt bi- bia bib bii bio bir bit biv boa bob boi boo bor bot bov bra brb bri bro brr brt brv bta btb bti bto btr btt btv bva bvb bvi bvo bvr bvt bvv i-v ia- iaa iab iai iao iar iat iav iba ibb ibi ibo ibr ibt ibv iia iib iii iio iir iit io- ioa iob ioi ioo ior iot iov ir- ira irb iri iro irr irt irv ita itb iti ito itt itv iva ivb ivi ivo ivr ivt ivv o-i oaa oab oai oao oar oat oav ob- oba obb obi obo obr obt obv oia oib oii oio oir oit oiv oo- ooa oob ooi ooo oor oot oov or- ora orb ori oro orr ort orv ot- ota otb oti oto otr ott otv ov- ova ovb ovi ovo ovv ra- raa rab rai rao rar rat rav rba rbb rbi rbo rbr rbt ria rib rii rio rir rit riv roa rob roi roo ror rot rov rra rrb rri rrr rrt rta rtb rti rto rtr rtt rtv rva rvb rvi rvo rvr rvt rvv taa tab tai tao tar tat tav tba tbb tbi tbo tbr tbt tbv tia tib tii tio tir tit tiv to- toa tob toi too tor tot tov tra trb tri tro trr trt trv tta ttb tti tto ttr ttt ttv tva tvb tvi tvo tvr tvt v-a vaa vab vai vao var vat vav vba vbi vbo vbr vbv vi- via vib vii vio vir vit viv voa vob voi voo vor vot vov vra vrb vri vrr vrt vta vtb vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv