-er eee eef eeo eer ef- efe eff efo efr eo- eoe eof eoo eor ere erf ero err fee fef feo fer ffe fff ffo ffr foe fof foo for fre frf fro frr oee oef oeo oer of- ofe off ofo ofr oo- oof ooo oor or- ore orf oro orr re- ree ref reo rer rfe rff rfo rfr roe rof roo ror rrf rrr

eeee eefe eero efeo efor eore erer eroe eroo erre erro feer fefe feff fefo feof fere fero ferr ffee ffff ffrr foer fofo foof for- fore foro forr free froe o-eo oere ofer off- offe offo offr ofor ofre ooer ooff oooo oore ore- oreo orer orfe orff oro- oroe orof oror orro reef refe reff refr reof rere rero rfef roer rofe roff rofo roof roor rore roro rrrr

eeeee efere effer efore eofor eorre erere eroor erore error feeor feere fefor feoff ferr- ferre ferro foore fore- foreo forro freer frere frore o-fer offer offof offre oo-er ooooo oreo- orere orero orfeo orfoe orfor oroer reefe reere refer reffe reffo rere- reree ro-ro roero roffe rofor rooer roofe roore rorer

effere effoff effore feeror feofor ferfer ferrer ferro- foerre foofoo forrer freeof frefre froofe oferre oooooo reefer reeffe refeff reroof roofer

eeeroer errorof feoffee feoffer feoffor ferrere ferrero foo-foo forfere forfree freefor off-off offeree offerer offeror refeoff referee referer reoffer rerefer

feeoffee forereef referree referrer

errorfree