a-a a-b a-t aaa aab aag aak aao aar aat aav ab- aba abb abg abk abo abr abt abv ag- aga agb agg agk ago agr agt agv aka akb akg akk ako akr akv aoa aob aog aok aoo aor aot aov ar- ara arb arg ark aro arr art arv at- ata atb atg ato atr att atv av- ava avb avg avk avo avr avt baa bab bag bak bao bar bat bav bba bbb bbg bbk bbo bbr bbt bga bgb bgg bgk bgo bgr bgt bgv bka bkb bkg bkk bko bkr bkt bkv boa bob bog bok boo bor bot bov bra brb brg brk bro brr brt brv bta btb btg btk bto btr btt btv bva bvb bvg bvk bvo bvr bvt bvv gaa gab gag gak gao gar gat gav gba gbg gbk gbo gbr gbt gbv gga ggb ggg ggo ggr ggt ggv gka gkb gko gkt goa gob gog gok goo gor got gov gra grb grg grk gro grr grt grv gta gtb gtg gtk gto gtr gtt gtv gva gvb gvg gvk gvo gvr gvt k-t ka- kaa kab kag kak kao kar kat kav kba kbb kbk kbo kbr kga kgb kgo kgv kkb kkk kkr kkt kkv koa kob kog kok koo kor kot kra krg krk kro krr krt krv kta ktb ktg ktk kto ktr ktt ktv kva kvb kvk kvo kvr kvv oaa oab oag oak oao oar oat oav ob- oba obb obg obk obo obr obt obv oga ogg ogo ogt oka okb okg okk oko okr oo- ooa oob oog ook ooo oor oot oov or- ora orb org ork oro orr ort orv ot- ota otb otg otk oto otr ott otv ov- ova ovb ovo ovv ra- raa rab rag rak rao rar rat rav rba rbb rbg rbk rbo rbr rbt rga rgb rgg rgk rgo rgr rgt rgv rkb rkg rkk rko rkt rkv roa rob rog rok roo ror rot rov rra rrb rrg rrk rrr rrt rta rtb rtg rtk rto rtr rtt rtv rva rvb rvg rvo rvr rvt rvv taa tab tag tak tao tar tat tav tba tbb tbg tbk tbo tbr tbt tbv tga tgb tgg tgk tgo tgr tgt tgv tka tkb tkg tkk tko tkr tkt to- toa tob tog tok too tor tot tov tra trb trg trk tro trr trt trv tta ttb ttg ttk tto ttr ttt ttv tva tvb tvg tvk tvo tvr tvt v-a vaa vab vag vak vao var vat vav vba vbg vbk vbo vbr vbv vga vgg vgo vgr vgt vka vkb vkg vkt voa vob vog vok voo vor vot vov vra vrb vrg vrk vrr vrt vta vtb vtg vtk vto vtr vtt vtv vva vvb vvg vvo vvr vvt vvv