dododo doorto dorood doropo dororo dotdot dotodo doudou dourou doutou doutro dropff dropof dropto drouot duffup dufour duport durtro f-prot foofoo foofur forout forrot foufou fourof fourou fourto fruupp ftroop furfur furour furrfu futuro ofdoor offord offput offutt ofpoor oftfor oofotr oooooo oordoo opdorp oporto optfor optoro optout ordoru ordrup orford orrour ortrud otford ottoor oudorp outfor outofp outour output outrup outtop outtro podofo poduru poodur poofup poopoo pop-up popduo popfor popoff popopo poporo popout poppop poptop portof pottop poupou pppppp profor profur propup propur proto- prutot puffup pupput purpur put-up putoff putour putout putput puttoo puttur rootof rootup rorodt rotour rotout rotrou routot rudrur ruptor rurutu rutour to-fro to-put tootoo top-up topoff toporu topout toppop torfou torodo tororo torpor tortor tortou tot-up totopo totoro totrot tou-fu toudou tourou toutou toutuo tropo- troppo trotro tuotuo turtur tururu tutour tuttut ufford up-put uppoor upprop uproot urdorf uropod uruppu utroor