eeee eero eete eext eore eoto epee eper epor epot epox eppo eppp epro eprp epte epxp er-x erer eret eroe eroo erpe erre erro etee eter etoe etox etre etro ette etto exer exo- exor expo expr expt exrx exte extr o-eo oere ooer oooo oore oort ootp opep oper opet opex opo- opor oppo opto ore- oreo orer orex oro- oroe oror orot orpe orro orte orto otee otep oter oto- otoe otoo otor otpp otre otro otte otto oxep oxer oxo- oxox oxxo peep peer peet peor pepe pepo per- pere pero perp perr pert pete peto petr pett poer poet poop poor poot pop- pope popo popp popt pore poro porr port pote poto pott pper pppo pppp pptt pre- pree prep pret prex pro- proe proo prop prot prox prtp prtr pter ptop ptox reep reet reop reot repe repo repp repr rept rere rero rert rete reto retr rett rexx roer roet roop roor root roox rope ropo rore roro rort rote roto rotr rott roxo rpet rpoe rrrr rtee rtex rttp teer teet teor tepe tepp ter- tere tero terp terr tete teto tetr tett tetx text toee toer toet toor toot top- tope topo topp topt tore toro torp torr tort torx tote toto totr tott tox- toxo toxt tper tppp tppr tpte tptp tptr tre- tree treo tret trex troe troo trop trot trox trpe trpp trte trtr tteo tter ttoe ttop tttt txtr xeer xer- xero xert xexe xoro xorp xote xoxo xper xpot xpto xrep xtep xtro xxxo xxxx