eeee eees eefe eeps eese eesi efes effi effs efsi eiei eies eifs eise eiss epee epes epi- epie epip epis eppp epps epsf epsi epsp epss esee eses esfp esfs esie esis espe espi espp esps esse essi essp fees fefe feff fefi feie feis feps fese fess ffee ffff ffii ffps ffss fief fies fife fiff fifi fiii fipp fips fise fisi fiss fsfi fspf fssf fssp ieie iesi ifes ifis ifps ifsp iies iiie iiii iiis iipf iisi iisp ipes ipie ippf ipse ipsi ipsp ipss isee isep ises isfp isie isis ispe ispf isps isse issf issi issp isss peep pees peff pefs peip peis pepe pepi peps pese pesi pess pfff pfis pfps piep pies piff pifs piip pipe pipi pipp pips pise pisi piss ppie ppif pppp ppps ppsf ppss psei psfs psip psis pspi pspp psps psse s-ii se-e se-f se-i se-s seef seep sees seff sefi seie seif seii seip seis sepe sepi sepp seps sese sesi sess sfss sief sies sife siff sipe sipi sipp sips sise sisi siss spee spef spes spfs spie spip spis sppf spps spse spsp spss ssee ssep sses ssfp ssis sspe sspf ssps sssf sssi ssss