eeee eete eetu eiei eier eipr eire eiti eitr epee eper epi- epie epip epit eppp eprp epte erei erer eret erie erit eriu erpe erre ertu erur etee eter etre ette etti ettu etui euer eur- eure eurt ieet ieie iere ieri iett iiie iiii iiit iitr iitt iper ipet ipie ippr ipri ipur iput iree irer iri- irie irip irpe irre irri irte irti irtp itep iter itet itie itri itup itur iuiu iupp peep peer peet peip peir peit pepe pepi per- pere peri perp perr pert peru pete peti petr pett peur peut piep pier piet piip pipe pipi pipp pire piri pirr piru pite piti pitr pitt pitu pper ppie pppp ppru pptt ppur pre- pree prep pret preu pri- prie prii prri prti prtp prtr prue prut pruu pter ptui pu-e puer puet pueu puir puit puiu pupe pupi pupu pur- pure puri purp purr puru put- pute puti putt putu reep reet reii reir reit reiu repe repi repp repr rept repu rere reri rert reru rete reti retr rett reue reup reut reuu riep rier riet rieu ripe ripi ripp ripr ript rire riri rite riti ritt ritu riue rpet rpii rrrr rtee rtei rttp ruer ruet ruit rupe rupp rupt rure ruri rurp ruru rute ruti rutt rutu teer teet teie teip teir teiu tepe tepi tepp tepu ter- tere teri terp terr teru tete teti tetr tett tetu teut tie- tiee tiei tiep tier tiet tiit tiiu tip- tipe tipi tipp tipt tipu tire tiri tirr tiru tite titi titp titt titu tper tpir tppp tppr tpte tptp tptr tput tre- tree trei tret treu tri- trie trip trit trpe trpp trte trtr true trut truu tter tttt tuei tuer tuet tuit tuiu tupe tupi tupu ture turi turp turr turt turu tute tuti tutt tutu u-ie u-rp ueir uepi uipi uirr upie uppe uppp uppu upri upup ure- uret urie uriu urre urri urte urup urur urut utep uter utri utti uttu uuri uuuu