-ana aaaa aaac aaaf aaan aaca aacc aacf aacn aaco aafa aafc aaff aana aaon aaoo acaa acac acan acca accc accf acco acfc acoa acon afaa afan afao afca afcc affa affc affo afoa afoo ana- anaa anac anan anao anca ancc anco anfa anfo anna anno ano- anoa anon aoca aono caaa caac caaf caan cac- caca cacc caco cafa cafc caff cana canc cann cano ccaa ccac ccaf ccca cccc cccf ccfa ccfc ccff ccna ccnc ccnf ccoc cfaa cfac cfao cfca cfcf cfcn cfco cfoa cnaa cnac cnco cnfa cnna coan coca coco cofc coff con- cona conc conf conn cono coof coon faaa faac faan faca facc fafa fafc faff fafo fana fanc fano faon fcca fccf ffcc ffff fnac foaf foan foca foco fofo fono foof foon naaa naac naan naca nacc nacf naco nafa nafc naff nafo nan- nana nann nano naoc ncaa ncac ncca nccc nccf nccn ncfc ncna ncnc ncoa ncoc nfaa nfff nfon nnnn noaa noac noco non- nona nonn nono noo- noon nooo oafc oafo ocac ocan occa occc occn ocfa ocna ocon ofan off- offa offc offo ofna ofno onan onc- onca oncf onco onna onno onon ooaa ooff oona oooo