f-prot foofoo forgot forrot forton fotron froggo ftroop go-off gofton gogoro gonnof gonogo goofon googoo gooroo gopfft gopoof gorgon gorgor goroon gorron gorton gotoff groton grotto n-toon ngongo noforn non-no non-op nonono nonoon nonpro noonoo noonor noonto noroff noroof norton not-go notfor notron notton nottoo ntopng off-go offton ofpoor oftfor ogongo on-off onfoot ontong oofotr oooooo oporto oppong optfor optoro orongo oroton ottoor pgpong pognon pogon- pogoro pongon ponton poopoo popfor popoff popopo poporo poppop poptop porno- porrog porron portof porton potron potton pottop pppppp profor progon pronto proto- proton ptgfrn rognon rogoff ronggo ronnon ronron roogoo rootof rooton rotton to-fro to-on toforn togrog tonono tonoro tonpon tonton tootoo topoff toppop topton torgon torgot tororo torpor tortor totnor totopo totoro totrot trogon tronto tropo- troppo trotro