a-a a-b a-i aaa aab aag aai aao aar aav ab- aba abb abg abi abo abr abv ag- aga agb agg agi ago agr agv ai- aia aib aig aii aio air aiv aoa aob aog aoi aoo aor aov ar- ara arb arg ari aro arr arv av- ava avb avg avi avo avr baa bab bag bai bao bar bav bba bbb bbg bbi bbo bbr bga bgb bgg bgi bgo bgr bgv bi- bia bib big bii bio bir biv boa bob bog boi boo bor bov bra brb brg bri bro brr brv bva bvb bvg bvi bvo bvr bvv gaa gab gag gai gao gar gav gba gbg gbi gbo gbr gbv gga ggb ggg ggi ggo ggr ggv gia gib gig gii gio gir giv goa gob gog goi goo gor gov gra grb grg gri gro grr grv gva gvb gvg gvi gvo gvr i-v ia- iaa iab iag iai iao iar iav iba ibb ibg ibi ibo ibr ibv iga igb igg igi igo igr iia iib iii iio iir io- ioa iob iog ioi ioo ior iov ir- ira irb irg iri iro irr irv iva ivb ivg ivi ivo ivr ivv o-i oaa oab oag oai oao oar oav ob- oba obb obg obi obo obr obv oga ogg ogi ogo oia oib oii oio oir oiv oo- ooa oob oog ooi ooo oor oov or- ora orb org ori oro orr orv ov- ova ovb ovi ovo ovv ra- raa rab rag rai rao rar rav rba rbb rbg rbi rbo rbr rga rgb rgg rgi rgo rgr rgv ria rib rig rii rio rir riv roa rob rog roi roo ror rov rra rrb rrg rri rrr rva rvb rvg rvi rvo rvr rvv v-a vaa vab vag vai vao var vav vba vbg vbi vbo vbr vbv vga vgg vgo vgr vi- via vib vig vii vio vir viv voa vob vog voi voo vor vov vra vrb vrg vri vrr vva vvb vvg vvi vvo vvr vvv