eeee eete eext epee eper eppp eprp epte epxp er-x erer eret erpe erre etee eter etre ette exer expr expt exrx exte extr peep peer peet pepe per- pere perp perr pert pete petr pett pper pppp pptt pre- pree prep pret prex prtp prtr pter reep reet repe repp repr rept rere rert rete retr rett rexx rpet rrrr rtee rtex rttp teer teet tepe tepp ter- tere terp terr tete tetr tett tetx text tper tppp tppr tpte tptp tptr tre- tree tret trex trpe trpp trte trtr tter tttt txtr xeer xer- xert xexe xper xrep xtep xxxx