a-a a-z aaa aaf aan aao aav aaz af- afa aff afn afo afv afz an- ana anf ann ano anv anz aoa aof aon aoo aov av- ava avf avn avo avz az- aza azf azn azo azz faa faf fan fao fav faz ffa fff ffn ffo ffv ffz fna fnf fnn fnv fnz foa fof fon foo foz fva naa naf nan nao nav naz nfa nff nfn nfo nfv nna nnf nnn nno nnv nnz no- noa nof non noo nov noz nva nvn nvv nzf nzo nzz oaa oaf oan oao oav of- ofa off ofn ofo ofv ofz on- ona onf onn ono oo- ooa oof oon ooo oov ov- ova ovf ovo ovv oza ozo ozz v-a vaa van vao vav vaz vfa vff vfn vfv vn- vna vnf vno vnv voa vof von voo vov voz vva vvo vvv vvz vzn zaa zaf zan zao zav zaz zfa zfn znn zno zo- zoa zof zon zoo zzz