a-a aaa aaf aak aan aao aav af- afa aff afk afn afo afv aka akk akn ako akv an- ana anf ank ann ano anv aoa aof aok aon aoo aov av- ava avf avk avn avo faa faf fak fan fao fav ffa fff ffk ffn ffo ffv fka fkf fkk fna fnf fnk fnn fnv foa fof fok fon foo fva fvk ka- kaa kaf kak kan kao kav kfa kff kfo kkk kkn kkv kn- kna knf knk knn kno koa kof kok kon koo kva kvk kvn kvo kvv naa naf nak nan nao nav nfa nff nfk nfn nfo nfv nka nkf nkk nkn nko nna nnf nnk nnn nno nnv no- noa nof nok non noo nov nva nvk nvn nvv oaa oaf oak oan oao oav of- ofa off ofn ofo ofv oka okk oko on- ona onf onk onn ono oo- ooa oof ook oon ooo oov ov- ova ovf ovo ovv v-a vaa vak van vao vav vfa vff vfn vfv vka vn- vna vnf vno vnv voa vof vok von voo vov vva vvo vvv