a-a aaa aaf aag aao aar aav af- afa aff afg afo afr afv ag- aga agf agg ago agr agv aoa aof aog aoo aor aov ar- ara arf arg aro arr arv av- ava avf avg avo avr faa faf fag fao far fav ffa fff ffg ffo ffr ffv fga fgf fgg fgr fgv foa fof fog foo for fra frf frg fro frr fva fvg gaa gaf gag gao gar gav gfa gff gfo gfr gga ggg ggo ggr ggv goa gof gog goo gor gov gra grf grg gro grr grv gva gvf gvg gvo gvr oaa oaf oag oao oar oav of- ofa off ofg ofo ofr ofv oga ogf ogg ogo oo- ooa oof oog ooo oor oov or- ora orf org oro orr orv ov- ova ovf ovo ovv ra- raa raf rag rao rar rav rfa rff rfg rfo rfr rfv rga rgf rgg rgo rgr rgv roa rof rog roo ror rov rra rrf rrg rrr rva rvf rvg rvo rvr rvv v-a vaa vag vao var vav vfa vff vfg vfr vfv vga vgf vgg vgo vgr voa vof vog voo vor vov vra vrf vrg vrr vva vvg vvo vvr vvv