eeee eefe eerg ef-g efgp egee eger egfp egfr egge eggp egpe egre epee eper eppp eprp epxp er-x erer erfx erg- ergg erpe erre exer exge expr exrx feer fefe feff fege fegg fere ferr ffee ffff ffrr fprf free frep frex geep geer gefe gege gegg gepe gere gfer ggfg gggg gper gpgp gprp gpxe gree gref greg grep grex grrr peep peer peff pegg pepe per- pere perf perg perp perr pfff pffr pger pper pppp pprf pre- pree pref preg prep prex reef reep refe reff refg refr rege regr repe repp repr rere rerg rexx rfef rrrr xeer xefe xer- xexe xfer xper xrep xxxx