burfis ubrfis brufis rbufis urbfis rubfis bufris ubfris bfuris fburis ufbris fubris brfuis rbfuis bfruis fbruis rfbuis frbuis urfbis rufbis ufrbis furbis rfubis frubis burifs ubrifs bruifs rbuifs urbifs rubifs buirfs ubirfs biurfs iburfs uibrfs iubrfs briufs rbiufs birufs ibrufs ribufs irbufs uribfs ruibfs uirbfs iurbfs riubfs irubfs bufirs ubfirs bfuirs fbuirs ufbirs fubirs buifrs ubifrs biufrs ibufrs uibfrs iubfrs bfiurs fbiurs bifurs ibfurs fiburs ifburs ufibrs fuibrs uifbrs iufbrs fiubrs ifubrs brfius rbfius bfrius fbrius rfbius frbius brifus rbifus birfus ibrfus ribfus irbfus bfirus fbirus bifrus ibfrus fibrus ifbrus rfibus fribus rifbus irfbus firbus ifrbus urfibs rufibs ufribs furibs rfuibs fruibs urifbs ruifbs uirfbs iurfbs riufbs irufbs ufirbs fuirbs uifrbs iufrbs fiurbs ifurbs rfiubs friubs rifubs irfubs firubs ifrubs burfsi ubrfsi brufsi rbufsi urbfsi rubfsi bufrsi ubfrsi bfursi fbursi ufbrsi fubrsi brfusi rbfusi bfrusi fbrusi rfbusi frbusi urfbsi rufbsi ufrbsi furbsi rfubsi frubsi bursfi ubrsfi brusfi rbusfi urbsfi rubsfi busrfi ubsrfi bsurfi sburfi usbrfi subrfi brsufi rbsufi bsrufi sbrufi rsbufi srbufi ursbfi rusbfi usrbfi surbfi rsubfi srubfi bufsri ubfsri bfusri fbusri ufbsri fubsri busfri ubsfri bsufri sbufri usbfri subfri bfsuri fbsuri bsfuri sbfuri fsburi sfburi ufsbri fusbri usfbri sufbri fsubri sfubri brfsui rbfsui bfrsui fbrsui rfbsui frbsui brsfui rbsfui bsrfui sbrfui rsbfui srbfui bfsrui fbsrui bsfrui sbfrui fsbrui sfbrui rfsbui frsbui rsfbui srfbui fsrbui sfrbui urfsbi rufsbi ufrsbi fursbi rfusbi frusbi ursfbi rusfbi usrfbi surfbi rsufbi srufbi ufsrbi fusrbi usfrbi sufrbi fsurbi sfurbi rfsubi frsubi rsfubi srfubi fsrubi sfrubi burisf ubrisf bruisf rbuisf urbisf rubisf buirsf ubirsf biursf ibursf uibrsf iubrsf briusf rbiusf birusf ibrusf ribusf irbusf uribsf ruibsf uirbsf iurbsf riubsf irubsf bursif ubrsif brusif rbusif urbsif rubsif busrif ubsrif bsurif sburif usbrif subrif brsuif rbsuif bsruif sbruif rsbuif srbuif ursbif rusbif usrbif surbif rsubif srubif buisrf ubisrf biusrf ibusrf uibsrf iubsrf busirf ubsirf bsuirf sbuirf usbirf subirf bisurf ibsurf bsiurf sbiurf isburf siburf uisbrf iusbrf usibrf suibrf isubrf siubrf brisuf rbisuf birsuf ibrsuf ribsuf irbsuf brsiuf rbsiuf bsriuf sbriuf rsbiuf srbiuf bisruf ibsruf bsiruf sbiruf isbruf sibruf risbuf irsbuf rsibuf sribuf isrbuf sirbuf urisbf ruisbf uirsbf iursbf riusbf irusbf ursibf rusibf usribf suribf rsuibf sruibf uisrbf iusrbf usirbf suirbf isurbf siurbf risubf irsubf rsiubf sriubf isrubf sirubf bufisr ubfisr bfuisr fbuisr ufbisr fubisr buifsr ubifsr biufsr ibufsr uibfsr iubfsr bfiusr fbiusr bifusr ibfusr fibusr ifbusr ufibsr fuibsr uifbsr iufbsr fiubsr ifubsr bufsir ubfsir bfusir fbusir ufbsir fubsir busfir ubsfir bsufir sbufir usbfir subfir bfsuir fbsuir bsfuir sbfuir fsbuir sfbuir ufsbir fusbir usfbir sufbir fsubir sfubir buisfr ubisfr biusfr ibusfr uibsfr iubsfr busifr ubsifr bsuifr sbuifr usbifr subifr bisufr ibsufr bsiufr sbiufr isbufr sibufr uisbfr iusbfr usibfr suibfr isubfr siubfr bfisur fbisur bifsur ibfsur fibsur ifbsur bfsiur fbsiur bsfiur sbfiur fsbiur sfbiur bisfur ibsfur bsifur sbifur isbfur sibfur fisbur ifsbur fsibur sfibur isfbur sifbur ufisbr fuisbr uifsbr iufsbr fiusbr ifusbr ufsibr fusibr usfibr sufibr fsuibr sfuibr uisfbr iusfbr usifbr suifbr isufbr siufbr fisubr ifsubr fsiubr sfiubr isfubr sifubr brfisu rbfisu bfrisu fbrisu rfbisu frbisu brifsu rbifsu birfsu ibrfsu ribfsu irbfsu bfirsu fbirsu bifrsu ibfrsu fibrsu ifbrsu rfibsu fribsu rifbsu irfbsu firbsu ifrbsu brfsiu rbfsiu bfrsiu fbrsiu rfbsiu frbsiu brsfiu rbsfiu bsrfiu sbrfiu rsbfiu srbfiu bfsriu fbsriu bsfriu sbfriu fsbriu sfbriu rfsbiu frsbiu rsfbiu srfbiu fsrbiu sfrbiu brisfu rbisfu birsfu ibrsfu ribsfu irbsfu brsifu rbsifu bsrifu sbrifu rsbifu srbifu bisrfu ibsrfu bsirfu sbirfu isbrfu sibrfu risbfu irsbfu rsibfu sribfu isrbfu sirbfu bfisru fbisru bifsru ibfsru fibsru ifbsru bfsiru fbsiru bsfiru sbfiru fsbiru sfbiru bisfru ibsfru bsifru sbifru isbfru sibfru fisbru ifsbru fsibru sfibru isfbru sifbru rfisbu frisbu rifsbu irfsbu firsbu ifrsbu rfsibu frsibu rsfibu srfibu fsribu sfribu risfbu irsfbu rsifbu srifbu isrfbu sirfbu fisrbu ifsrbu fsirbu sfirbu isfrbu sifrbu urfisb rufisb ufrisb furisb rfuisb fruisb urifsb ruifsb uirfsb iurfsb riufsb irufsb ufirsb fuirsb uifrsb iufrsb fiursb ifursb rfiusb friusb rifusb irfusb firusb ifrusb urfsib rufsib ufrsib fursib rfusib frusib ursfib rusfib usrfib surfib rsufib srufib ufsrib fusrib usfrib sufrib fsurib sfurib rfsuib frsuib rsfuib srfuib fsruib sfruib urisfb ruisfb uirsfb iursfb riusfb irusfb ursifb rusifb usrifb surifb rsuifb sruifb uisrfb iusrfb usirfb suirfb isurfb siurfb risufb irsufb rsiufb sriufb isrufb sirufb ufisrb fuisrb uifsrb iufsrb fiusrb ifusrb ufsirb fusirb usfirb sufirb fsuirb sfuirb uisfrb iusfrb usifrb suifrb isufrb siufrb fisurb ifsurb fsiurb sfiurb isfurb sifurb rfisub frisub rifsub irfsub firsub ifrsub rfsiub frsiub rsfiub srfiub fsriub sfriub risfub irsfub rsifub srifub isrfub sirfub fisrub ifsrub fsirub sfirub isfrub sifrub
Note: these 'words' (valid or invalid) are all the permutations of the word burfis. These words are obtained by scrambling the letters in burfis.