a-a a-b a-t aaa aab aag aao aar aat aav ab- aba abb abg abo abr abt abv ag- aga agb agg ago agr agt agv aoa aob aog aoo aor aot aov ar- ara arb arg aro arr art arv at- ata atb atg ato atr att atv av- ava avb avg avo avr avt baa bab bag bao bar bat bav bba bbb bbg bbo bbr bbt bga bgb bgg bgo bgr bgt bgv boa bob bog boo bor bot bov bra brb brg bro brr brt brv bta btb btg bto btr btt btv bva bvb bvg bvo bvr bvt bvv gaa gab gag gao gar gat gav gba gbg gbo gbr gbt gbv gga ggb ggg ggo ggr ggt ggv goa gob gog goo gor got gov gra grb grg gro grr grt grv gta gtb gtg gto gtr gtt gtv gva gvb gvg gvo gvr gvt oaa oab oag oao oar oat oav ob- oba obb obg obo obr obt obv oga ogg ogo ogt oo- ooa oob oog ooo oor oot oov or- ora orb org oro orr ort orv ot- ota otb otg oto otr ott otv ov- ova ovb ovo ovv ra- raa rab rag rao rar rat rav rba rbb rbg rbo rbr rbt rga rgb rgg rgo rgr rgt rgv roa rob rog roo ror rot rov rra rrb rrg rrr rrt rta rtb rtg rto rtr rtt rtv rva rvb rvg rvo rvr rvt rvv taa tab tag tao tar tat tav tba tbb tbg tbo tbr tbt tbv tga tgb tgg tgo tgr tgt tgv to- toa tob tog too tor tot tov tra trb trg tro trr trt trv tta ttb ttg tto ttr ttt ttv tva tvb tvg tvo tvr tvt v-a vaa vab vag vao var vat vav vba vbg vbo vbr vbv vga vgg vgo vgr vgt voa vob vog voo vor vot vov vra vrb vrg vrr vrt vta vtb vtg vto vtr vtt vtv vva vvb vvg vvo vvr vvt vvv