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 frefre freire frette fterer fterie fterre i-free i-tree iffier ifreet irrite ittiri r-tree reefer reeffe refeet refeff refert refete refire refrei refret refter reiter reteer reteet retere retief retire retree retret retter rieter riette rietti riffer rififi rifter rititi ritter t-tree teetee teeter teirei terete terrer terret terrie terrif territ terter tertre tetete tetter tiefer tierer tieret tiete tietie tiff-f tirret tirrit titiri tittee titter tittie treete trefet trefte treife tretee tretie trette trifet triter