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eeeee efere effer efore efuru eofor eorre erere eroor erore error euro- eurre feeor feere fefor feoff ferr- ferre ferro feuer foore fore- foreo forro forur fouee foure fouro freer frere freur frore fu-fu fuero furo- furor o-fer offer offof offre ofour oo-er ooooo oreo- orere orero orfeo orfeu orfoe orfor oroer oruro ouoro oure- reefe reere refer reffe reffo rere- reree reuer ro-ro roero roffe rofor rooer roofe roore rooue rorer rouer roufe roure ruere ruffe ruffo rufo- ufere ufofu uouee ureo- urour uuuuu

e-four effere effoff effore errour eururo feeror feofor ferfer ferrer ferro- ferrur foerre foofoo foofur forrer forure foufou fourer fourof fourou freeof frefre freure froofe fufore furfur furore furour furrer furrfu oferre oooooo orrour ouerre reefer reeffe refeff reroof reuere reuour roofer rouffe ruffer urouer uroure uruffe

eeeroer errorof feoffee feoffer feoffor ferrere ferrero ferrour ferrure foo-foo for-rue forfere forfree fou-fou freefor furrour furrure off-off offeree offerer offeror orrouer ourouer refeoff referee referer reoffer rerefer

feeoffee forereef fourree froufrou referree referrer

errorfree four-four frou-frou