ruffin urffin rfufin frufin ufrfin furfin ruffin urffin rfufin frufin ufrfin furfin rffuin frfuin rffuin frfuin ffruin ffruin uffrin fufrin uffrin fufrin ffurin ffurin rufifn urfifn rfuifn fruifn ufrifn furifn ruiffn uriffn riuffn iruffn uirffn iurffn rfiufn friufn rifufn irfufn firufn ifrufn ufirfn fuirfn uifrfn iufrfn fiurfn ifurfn rufifn urfifn rfuifn fruifn ufrifn furifn ruiffn uriffn riuffn iruffn uirffn iurffn rfiufn friufn rifufn irfufn firufn ifrufn ufirfn fuirfn uifrfn iufrfn fiurfn ifurfn rffiun frfiun rffiun frfiun ffriun ffriun rfifun frifun riffun irffun firfun ifrfun rfifun frifun riffun irffun firfun ifrfun ffirun ffirun fifrun iffrun fifrun iffrun uffirn fufirn uffirn fufirn ffuirn ffuirn ufifrn fuifrn uiffrn iuffrn fiufrn ifufrn ufifrn fuifrn uiffrn iuffrn fiufrn ifufrn ffiurn ffiurn fifurn iffurn fifurn iffurn ruffni urffni rfufni frufni ufrfni furfni ruffni urffni rfufni frufni ufrfni furfni rffuni frfuni rffuni frfuni ffruni ffruni uffrni fufrni uffrni fufrni ffurni ffurni rufnfi urfnfi rfunfi frunfi ufrnfi furnfi runffi urnffi rnuffi nruffi unrffi nurffi rfnufi frnufi rnfufi nrfufi fnrufi nfrufi ufnrfi funrfi unfrfi nufrfi fnurfi nfurfi rufnfi urfnfi rfunfi frunfi ufrnfi furnfi runffi urnffi rnuffi nruffi unrffi nurffi rfnufi frnufi rnfufi nrfufi fnrufi nfrufi ufnrfi funrfi unfrfi nufrfi fnurfi nfurfi rffnui frfnui rffnui frfnui ffrnui ffrnui rfnfui frnfui rnffui nrffui fnrfui nfrfui rfnfui frnfui rnffui nrffui fnrfui nfrfui ffnrui ffnrui fnfrui nffrui fnfrui nffrui uffnri fufnri uffnri fufnri ffunri ffunri ufnfri funfri unffri nuffri fnufri nfufri ufnfri funfri unffri nuffri fnufri nfufri ffnuri ffnuri fnfuri nffuri fnfuri nffuri rufinf urfinf rfuinf fruinf ufrinf furinf ruifnf urifnf riufnf irufnf uirfnf iurfnf rfiunf friunf rifunf irfunf firunf ifrunf ufirnf fuirnf uifrnf iufrnf fiurnf ifurnf rufnif urfnif rfunif frunif ufrnif furnif runfif urnfif rnufif nrufif unrfif nurfif rfnuif frnuif rnfuif nrfuif fnruif nfruif ufnrif funrif unfrif nufrif fnurif nfurif ruinff urinff riunff irunff uirnff iurnff runiff urniff rnuiff nruiff unriff nuriff rinuff irnuff rniuff nriuff inruff niruff uinrff iunrff unirff nuirff inurff niurff rfinuf frinuf rifnuf irfnuf firnuf ifrnuf rfniuf frniuf rnfiuf nrfiuf fnriuf nfriuf rinfuf irnfuf rnifuf nrifuf inrfuf nirfuf finruf ifnruf fniruf nfiruf infruf nifruf ufinrf fuinrf uifnrf iufnrf fiunrf ifunrf ufnirf funirf unfirf nufirf fnuirf nfuirf uinfrf iunfrf unifrf nuifrf inufrf niufrf finurf ifnurf fniurf nfiurf infurf nifurf rufinf urfinf rfuinf fruinf ufrinf furinf ruifnf urifnf riufnf irufnf uirfnf iurfnf rfiunf friunf rifunf irfunf firunf ifrunf ufirnf fuirnf uifrnf iufrnf fiurnf ifurnf rufnif urfnif rfunif frunif ufrnif furnif runfif urnfif rnufif nrufif unrfif nurfif rfnuif frnuif rnfuif nrfuif fnruif nfruif ufnrif funrif unfrif nufrif fnurif nfurif ruinff urinff riunff irunff uirnff iurnff runiff urniff rnuiff nruiff unriff nuriff rinuff irnuff rniuff nriuff inruff niruff uinrff iunrff unirff nuirff inurff niurff rfinuf frinuf rifnuf irfnuf firnuf ifrnuf rfniuf frniuf rnfiuf nrfiuf fnriuf nfriuf rinfuf irnfuf rnifuf nrifuf inrfuf nirfuf finruf ifnruf fniruf nfiruf infruf nifruf ufinrf fuinrf uifnrf iufnrf fiunrf ifunrf ufnirf funirf unfirf nufirf fnuirf nfuirf uinfrf iunfrf unifrf nuifrf inufrf niufrf finurf ifnurf fniurf nfiurf infurf nifurf rffinu frfinu rffinu frfinu ffrinu ffrinu rfifnu frifnu riffnu irffnu firfnu ifrfnu rfifnu frifnu riffnu irffnu firfnu ifrfnu ffirnu ffirnu fifrnu iffrnu fifrnu iffrnu rffniu frfniu rffniu frfniu ffrniu ffrniu rfnfiu frnfiu rnffiu nrffiu fnrfiu nfrfiu rfnfiu frnfiu rnffiu nrffiu fnrfiu nfrfiu ffnriu ffnriu fnfriu nffriu fnfriu nffriu rfinfu frinfu rifnfu irfnfu firnfu ifrnfu rfnifu frnifu rnfifu nrfifu fnrifu nfrifu rinffu irnffu rniffu nriffu inrffu nirffu finrfu ifnrfu fnirfu nfirfu infrfu nifrfu rfinfu frinfu rifnfu irfnfu firnfu ifrnfu rfnifu frnifu rnfifu nrfifu fnrifu nfrifu rinffu irnffu rniffu nriffu inrffu nirffu finrfu ifnrfu fnirfu nfirfu infrfu nifrfu ffinru ffinru fifnru iffnru fifnru iffnru ffniru ffniru fnfiru nffiru fnfiru nffiru finfru ifnfru fnifru nfifru inffru niffru finfru ifnfru fnifru nfifru inffru niffru uffinr fufinr uffinr fufinr ffuinr ffuinr ufifnr fuifnr uiffnr iuffnr fiufnr ifufnr ufifnr fuifnr uiffnr iuffnr fiufnr ifufnr ffiunr ffiunr fifunr iffunr fifunr iffunr uffnir fufnir uffnir fufnir ffunir ffunir ufnfir funfir unffir nuffir fnufir nfufir ufnfir funfir unffir nuffir fnufir nfufir ffnuir ffnuir fnfuir nffuir fnfuir nffuir ufinfr fuinfr uifnfr iufnfr fiunfr ifunfr ufnifr funifr unfifr nufifr fnuifr nfuifr uinffr iunffr uniffr nuiffr inuffr niuffr finufr ifnufr fniufr nfiufr infufr nifufr ufinfr fuinfr uifnfr iufnfr fiunfr ifunfr ufnifr funifr unfifr nufifr fnuifr nfuifr uinffr iunffr uniffr nuiffr inuffr niuffr finufr ifnufr fniufr nfiufr infufr nifufr ffinur ffinur fifnur iffnur fifnur iffnur ffniur ffniur fnfiur nffiur fnfiur nffiur finfur ifnfur fnifur nfifur inffur niffur finfur ifnfur fnifur nfifur inffur niffur
Note: these 'words' (valid or invalid) are all the permutations of the word ruffin. These words are obtained by scrambling the letters in ruffin.