effing fefing effing fefing ffeing ffeing efifng feifng eiffng ieffng fiefng ifefng efifng feifng eiffng ieffng fiefng ifefng ffieng ffieng fifeng iffeng fifeng iffeng effnig fefnig effnig fefnig ffenig ffenig efnfig fenfig enffig neffig fnefig nfefig efnfig fenfig enffig neffig fnefig nfefig ffneig ffneig fnfeig nffeig fnfeig nffeig efinfg feinfg eifnfg iefnfg fienfg ifenfg efnifg fenifg enfifg nefifg fneifg nfeifg einffg ienffg eniffg neiffg ineffg nieffg finefg ifnefg fniefg nfiefg infefg nifefg efinfg feinfg eifnfg iefnfg fienfg ifenfg efnifg fenifg enfifg nefifg fneifg nfeifg einffg ienffg eniffg neiffg ineffg nieffg finefg ifnefg fniefg nfiefg infefg nifefg ffineg ffineg fifneg iffneg fifneg iffneg ffnieg ffnieg fnfieg nffieg fnfieg nffieg finfeg ifnfeg fnifeg nfifeg inffeg niffeg finfeg ifnfeg fnifeg nfifeg inffeg niffeg effign fefign effign fefign ffeign ffeign efifgn feifgn eiffgn ieffgn fiefgn ifefgn efifgn feifgn eiffgn ieffgn fiefgn ifefgn ffiegn ffiegn fifegn iffegn fifegn iffegn effgin fefgin effgin fefgin ffegin ffegin efgfin fegfin egffin geffin fgefin gfefin efgfin fegfin egffin geffin fgefin gfefin ffgein ffgein fgfein gffein fgfein gffein efigfn feigfn eifgfn iefgfn fiegfn ifegfn efgifn fegifn egfifn gefifn fgeifn gfeifn eigffn iegffn egiffn geiffn igeffn gieffn figefn ifgefn fgiefn gfiefn igfefn gifefn efigfn feigfn eifgfn iefgfn fiegfn ifegfn efgifn fegifn egfifn gefifn fgeifn gfeifn eigffn iegffn egiffn geiffn igeffn gieffn figefn ifgefn fgiefn gfiefn igfefn gifefn ffigen ffigen fifgen iffgen fifgen iffgen ffgien ffgien fgfien gffien fgfien gffien figfen ifgfen fgifen gfifen igffen giffen figfen ifgfen fgifen gfifen igffen giffen effngi fefngi effngi fefngi ffengi ffengi efnfgi fenfgi enffgi neffgi fnefgi nfefgi efnfgi fenfgi enffgi neffgi fnefgi nfefgi ffnegi ffnegi fnfegi nffegi fnfegi nffegi effgni fefgni effgni fefgni ffegni ffegni efgfni fegfni egffni geffni fgefni gfefni efgfni fegfni egffni geffni fgefni gfefni ffgeni ffgeni fgfeni gffeni fgfeni gffeni efngfi fengfi enfgfi nefgfi fnegfi nfegfi efgnfi fegnfi egfnfi gefnfi fgenfi gfenfi engffi negffi egnffi genffi ngeffi gneffi fngefi nfgefi fgnefi gfnefi ngfefi gnfefi efngfi fengfi enfgfi nefgfi fnegfi nfegfi efgnfi fegnfi egfnfi gefnfi fgenfi gfenfi engffi negffi egnffi genffi ngeffi gneffi fngefi nfgefi fgnefi gfnefi ngfefi gnfefi ffngei ffngei fnfgei nffgei fnfgei nffgei ffgnei ffgnei fgfnei gffnei fgfnei gffnei fngfei nfgfei fgnfei gfnfei ngffei gnffei fngfei nfgfei fgnfei gfnfei ngffei gnffei efingf feingf eifngf iefngf fiengf ifengf efnigf fenigf enfigf nefigf fneigf nfeigf einfgf ienfgf enifgf neifgf inefgf niefgf finegf ifnegf fniegf nfiegf infegf nifegf efignf feignf eifgnf iefgnf fiegnf ifegnf efginf feginf egfinf gefinf fgeinf gfeinf eigfnf iegfnf egifnf geifnf igefnf giefnf figenf ifgenf fgienf gfienf igfenf gifenf efngif fengif enfgif nefgif fnegif nfegif efgnif fegnif egfnif gefnif fgenif gfenif engfif negfif egnfif genfif ngefif gnefif fngeif nfgeif fgneif gfneif ngfeif gnfeif eingff iengff enigff neigff inegff niegff eignff iegnff eginff geinff igenff gienff engiff negiff egniff geniff ngeiff gneiff ingeff nigeff igneff gineff ngieff gnieff fingef ifngef fnigef nfigef infgef nifgef fignef ifgnef fginef gfinef igfnef gifnef fngief nfgief fgnief gfnief ngfief gnfief ingfef nigfef ignfef ginfef ngifef gnifef efingf feingf eifngf iefngf fiengf ifengf efnigf fenigf enfigf nefigf fneigf nfeigf einfgf ienfgf enifgf neifgf inefgf niefgf finegf ifnegf fniegf nfiegf infegf nifegf efignf feignf eifgnf iefgnf fiegnf ifegnf efginf feginf egfinf gefinf fgeinf gfeinf eigfnf iegfnf egifnf geifnf igefnf giefnf figenf ifgenf fgienf gfienf igfenf gifenf efngif fengif enfgif nefgif fnegif nfegif efgnif fegnif egfnif gefnif fgenif gfenif engfif negfif egnfif genfif ngefif gnefif fngeif nfgeif fgneif gfneif ngfeif gnfeif eingff iengff enigff neigff inegff niegff eignff iegnff eginff geinff igenff gienff engiff negiff egniff geniff ngeiff gneiff ingeff nigeff igneff gineff ngieff gnieff fingef ifngef fnigef nfigef infgef nifgef fignef ifgnef fginef gfinef igfnef gifnef fngief nfgief fgnief gfnief ngfief gnfief ingfef nigfef ignfef ginfef ngifef gnifef ffinge ffinge fifnge iffnge fifnge iffnge ffnige ffnige fnfige nffige fnfige nffige finfge ifnfge fnifge nfifge inffge niffge finfge ifnfge fnifge nfifge inffge niffge ffigne ffigne fifgne iffgne fifgne iffgne ffgine ffgine fgfine gffine fgfine gffine figfne ifgfne fgifne gfifne igffne giffne figfne ifgfne fgifne gfifne igffne giffne ffngie ffngie fnfgie nffgie fnfgie nffgie ffgnie ffgnie fgfnie gffnie fgfnie gffnie fngfie nfgfie fgnfie gfnfie ngffie gnffie fngfie nfgfie fgnfie gfnfie ngffie gnffie fingfe ifngfe fnigfe nfigfe infgfe nifgfe fignfe ifgnfe fginfe gfinfe igfnfe gifnfe fngife nfgife fgnife gfnife ngfife gnfife ingffe nigffe ignffe ginffe ngiffe gniffe fingfe ifngfe fnigfe nfigfe infgfe nifgfe fignfe ifgnfe fginfe gfinfe igfnfe gifnfe fngife nfgife fgnife gfnife ngfife gnfife ingffe nigffe ignffe ginffe ngiffe gniffe
Note: these 'words' (valid or invalid) are all the permutations of the word effing. These words are obtained by scrambling the letters in effing.