a-a aaa aaf aag aan aao aav af- afa aff afg afn afo afv ag- aga agf agg agn ago agv an- ana anf ang ann ano anv aoa aof aog aon aoo aov av- ava avf avg avn avo faa faf fag fan fao fav ffa fff ffg ffn ffo ffv fga fgf fgg fgn fgv fna fnf fng fnn fnv foa fof fog fon foo fva fvg gaa gaf gag gan gao gav gfa gff gfo gga ggg ggn ggo ggv gna gnf gnn gno gnv goa gof gog gon goo gov gva gvf gvg gvn gvo naa naf nag nan nao nav nfa nff nfn nfo nfv nga ngf ngg ngn ngo nna nnf nng nnn nno nnv no- noa nof nog non noo nov nva nvg nvn nvv oaa oaf oag oan oao oav of- ofa off ofg ofn ofo ofv oga ogf ogg ogn ogo on- ona onf ong onn ono oo- ooa oof oog oon ooo oov ov- ova ovf ovo ovv v-a vaa vag van vao vav vfa vff vfg vfn vfv vga vgf vgg vgn vgo vn- vna vnf vng vno vnv voa vof vog von voo vov vva vvg vvo vvv