e-port effere effete effoff effore effort efreet efter- ekero eototo epopee eroto- errett etoeot ettore f-prot feeror feetof fekete feofor ferfer feroke ferrer ferret ferro- fertee fertek ferter fetter foerre foeto- foetor fokker foofoo fooker footer fopper foppet forker forket forpet forrer forrot fortee forter freeof freepr freeto frefre frette froofe fterer fterre ftroop k-tree keefer keeffe keeker keeper keepto keokee kepper keptto kereft kerfot kerker kertee kertok ketter koffee kokopo kokoro kokott kokpek kookoo koopoo kootoo kopeek kopete koreke korere korero korkor kororo korrek kotoko kotter kottke kpetoe krefft kreker kreope kretek krokek kroket krotte ktetor oerter oferre offeet ofpoor oftfor okeefe okerer okopek okpofe okpoko oofotr ookroo oooooo oporto oppert optfor optoro orpeko ortprk ottoor ottope peeker peepee peeper peerer peeter peetre peffer pepero pepkor pepper pepto- perere pereto peroff peroke peroor perore perper perpet perree perret perrot pertek perter pertre peteet petoro petree petrer petro- petrof petter pettet poetto poffer pokerf poketo pokret pookoo pooper poopet poopoo poorer pooter popfor popoff popopo poporo popote popper poppet poppop poptop porete porker porket porret porte- portee portek porter portet portof poteet potere potter pottok pottop ppoker pppppp pre-op prefer prefet preffe preket preore preter pretok pretor pretre prette pretto prkeet profer profet proffe profor profre proker proket prokke prokop proper propre prote- proter proto- ptero- r-tree reefer reeffe reeker reekof reeper refeet refeff refert refete refoot refret refter repete repope report repper repref reroof reroot reteer reteet reteoo retere retook retore retort retree retret retro- retrot retter roeper roepke rokete rokker rokket rokkor roofer rooker roopee roopek rooper rooter rootof rootte ropeto rorek rorter rotork rotter t-tree teeoff teepee teetee teeter teetop teketo tepoto tepper terete terper terreo terrer terret terror terrot terter tertre tetete tetter to-eke to-fro toetoe toffee tofore tokeep toofer tookto tooter tootoo topepo topete topfer topoff topote topper toppet toppop torero torfer torker torope tororo torpor torret tortor totopo totoro totrot totter treeof treete trefet trefor trefot trefte treker trepot treppe tretee tretop trette troffe troker tropee troper tropo- troppo trotro trotte