eerier effeir effere effete efreet efter- eifert er-rif errett feerie feifer feirie ferfer ferier ferrer ferret ferri- ferrie fertee ferter fetter fiefie fierte fiftie firret fitter fittie fittit freepr frefre freire frette fterer fterie fterre i-free i-tree iffier ifreet ipeter ipfire irrite ittiri peepee peeper peerer peerie peeter peetre peetri peffer peiere peiper pepper perere perfit perier perire perite perper perpet perree perret perrie perter pertie pertre peteet peteri petiet petite petitf petree petrer petri- petrie petter pettet petti- pettit pieper pierie pierre pierri pieter pietri piette piffer piperi pipier pipipi pipiri pipper pippet pippip piree pirrie pirrip pitier pitpit pitter pittie pppppp preeti prefer prefet preffe preier preiff preire preter pretre prette priefe priere priffe prifti pterri r-tree reefer reeffe reeper refeet refeff refert refete refire refrei refret refter reiter repete repier repipe repper repref reprie reteer reteet retere retief retire retree retret retrip retter rieter riette rietti riffer rififi rifter ripert ripier ripper rippet rippit rititi ritter t-tree teepee teetee teeter teirei teppei tepper terepi terete terper terrer terret terrie terrif territ terter tertre tetete tetter tiefer tierer tieret tiete tietie tiff-f tip-it tipiti tippee tipper tippet tippit tirret tirrit titfer titiri tittee titter tittie treete trefet trefte treife treppe tretee tretie trette trifet tripet trippe triter tritip