eeee eero eete eore eoto epee eper epor epot eppo eppp epro eprp epte erer eret eroe eroo erpe erre erro etee eter etoe etre etro ette etto o-eo oere ooer oooo oore oort ootp opep oper opet opo- opor oppo opto ore- oreo orer oro- oroe oror orot orpe orro orte orto otee otep oter oto- otoe otoo otor otpp otre otro otte otto 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 pro- proe proo prop prot prtp prtr pter ptop reep reet reop reot repe repo repp repr rept rere rero rert rete reto retr rett roer roet roop roor root rope ropo rore roro rort rote roto rotr rott rpet rpoe rrrr rtee rttp teer teet teor tepe tepp ter- tere tero terp terr tete teto tetr tett toee toer toet toor toot top- tope topo topp topt tore toro torp torr tort tote toto totr tott tper tppp tppr tpte tptp tptr tre- tree treo tret troe troo trop trot trpe trpp trte trtr tteo tter ttoe ttop tttt