eeee eete eiei eier eipr eire eiti eitr epee eper epi- epie epip epit eppp eprp epte erei erer eret erie erit erpe erre etee eter etre ette etti ieet ieie iere ieri iett iiie iiii iiit iitr iitt iper ipet ipie ippr ipri iree irer iri- irie irip irpe irre irri irte irti irtp itep iter itet itie itri peep peer peet peip peir peit pepe pepi per- pere peri perp perr pert pete peti petr pett piep pier piet piip pipe pipi pipp pire piri pirr pite piti pitr pitt pper ppie pppp pptt pre- pree prep pret pri- prie prii prri prti prtp prtr pter reep reet reii reir reit repe repi repp repr rept rere reri rert rete reti retr rett riep rier riet ripe ripi ripp ripr ript rire riri rite riti ritt rpet rpii rrrr rtee rtei rttp teer teet teie teip teir tepe tepi tepp ter- tere teri terp terr tete teti tetr tett tie- tiee tiei tiep tier tiet tiit tip- tipe tipi tipp tipt tire tiri tirr tite titi titp titt tper tpir tppp tppr tpte tptp tptr tre- tree trei tret tri- trie trip trit trpe trpp trte trtr tter tttt