-tree eeeee efere efetf effer effet efore efter ekeko ekker ektor eofor eorre erere erkko eroor erore eroto error erte erter eteke etete etoko etoro etree etrek etter feeor feere fefor feoff feret ferr- ferre ferro ferte feter feto- fetor fette fokke fokto foore foote fore- foreo foret forro forte forto fotte freek freer freet freke frere frett froot frore frote ftrtt keefe keere kefee kerek keret kerre ketek keter keto- kette ketto ko-ko kofte koker koket kokko kokor kokot kokre korek korff korke koror korro korte kotor kotto kre-o kreef kreek kreke kreo- krete kroft kroke kroot krtok o-fer offek offer offof offre offto ofoto ofter okeke okere oketo okker okoro oo-er ooooo oreo- orere orero orfeo orfoe orfor oroer oroke orret orter ortet ortok ortoo otere otero ototo otrok otter reefe reeft reere refer refet reffe reffo rekke rere- reree reret retee reter retro rette retto ro-ro roero roffe rofor rokee roker roket rokke rokkk rokot rokto rooer roofe rooft rooke roore roote rorer rorke roter rotko roto- rotor rotot rotte rotto rt-rk teeko tefe teket tekke tekko terek teret terok teror terre terro tert- teter tetr- tetro tette toeof toerr toeto tofet toffo tofor tofte toker tokke tokko toko- tokor tooke toore toreo toret torke torok torre torro torte torto toter toto- totoe totok totoo totte treer treet trefe treff trere trete trett troee trofe troff troft troke trott tteok ttttt