birses ibrses brises rbises irbses ribses bisres ibsres bsires sbires isbres sibres brsies rbsies bsries sbries rsbies srbies irsbes risbes isrbes sirbes rsibes sribes biress ibress briess rbiess irbess ribess bierss iberss beirss ebirss iebrss eibrss breiss rbeiss beriss ebriss rebiss erbiss irebss riebss ierbss eirbss reibss eribss bisers ibsers bsiers sbiers isbers sibers biesrs ibesrs beisrs ebisrs iebsrs eibsrs bseirs sbeirs besirs ebsirs sebirs esbirs isebrs siebrs iesbrs eisbrs seibrs esibrs brseis rbseis bsreis sbreis rsbeis srbeis bresis rbesis bersis ebrsis rebsis erbsis bseris sberis besris ebsris sebris esbris rsebis srebis resbis ersbis serbis esrbis irsebs risebs isrebs sirebs rsiebs sriebs iresbs riesbs iersbs eirsbs reisbs erisbs iserbs sierbs iesrbs eisrbs seirbs esirbs rseibs sreibs resibs ersibs seribs esribs birsse ibrsse brisse rbisse irbsse ribsse bisrse ibsrse bsirse sbirse isbrse sibrse brsise rbsise bsrise sbrise rsbise srbise irsbse risbse isrbse sirbse rsibse sribse birsse ibrsse brisse rbisse irbsse ribsse bisrse ibsrse bsirse sbirse isbrse sibrse brsise rbsise bsrise sbrise rsbise srbise irsbse risbse isrbse sirbse rsibse sribse bissre ibssre bsisre sbisre isbsre sibsre bissre ibssre bsisre sbisre isbsre sibsre bssire sbsire bssire sbsire ssbire ssbire issbre sisbre issbre sisbre ssibre ssibre brssie rbssie bsrsie sbrsie rsbsie srbsie brssie rbssie bsrsie sbrsie rsbsie srbsie bssrie sbsrie bssrie sbsrie ssbrie ssbrie rssbie srsbie rssbie srsbie ssrbie ssrbie irssbe rissbe isrsbe sirsbe rsisbe srisbe irssbe rissbe isrsbe sirsbe rsisbe srisbe issrbe sisrbe issrbe sisrbe ssirbe ssirbe rssibe srsibe rssibe srsibe ssribe ssribe biress ibress briess rbiess irbess ribess bierss iberss beirss ebirss iebrss eibrss breiss rbeiss beriss ebriss rebiss erbiss irebss riebss ierbss eirbss reibss eribss birses ibrses brises rbises irbses ribses bisres ibsres bsires sbires isbres sibres brsies rbsies bsries sbries rsbies srbies irsbes risbes isrbes sirbes rsibes sribes biesrs ibesrs beisrs ebisrs iebsrs eibsrs bisers ibsers bsiers sbiers isbers sibers besirs ebsirs bseirs sbeirs esbirs sebirs iesbrs eisbrs isebrs siebrs esibrs seibrs bresis rbesis bersis ebrsis rebsis erbsis brseis rbseis bsreis sbreis rsbeis srbeis besris ebsris bseris sberis esbris sebris resbis ersbis rsebis srebis esrbis serbis iresbs riesbs iersbs eirsbs reisbs erisbs irsebs risebs isrebs sirebs rsiebs sriebs iesrbs eisrbs iserbs sierbs esirbs seirbs resibs ersibs rseibs sreibs esribs seribs bisesr ibsesr bsiesr sbiesr isbesr sibesr biessr ibessr beissr ebissr iebssr eibssr bseisr sbeisr besisr ebsisr sebisr esbisr isebsr siebsr iesbsr eisbsr seibsr esibsr bisser ibsser bsiser sbiser isbser sibser bisser ibsser bsiser sbiser isbser sibser bssier sbsier bssier sbsier ssbier ssbier issber sisber issber sisber ssiber ssiber biessr ibessr beissr ebissr iebssr eibssr bisesr ibsesr bsiesr sbiesr isbesr sibesr besisr ebsisr bseisr sbeisr esbisr sebisr iesbsr eisbsr isebsr siebsr esibsr seibsr bsesir sbesir bessir ebssir sebsir esbsir bsseir sbseir bsseir sbseir ssbeir ssbeir bessir ebssir bsesir sbesir esbsir sebsir sesbir essbir ssebir ssebir essbir sesbir isesbr siesbr iessbr eissbr seisbr esisbr issebr sisebr issebr sisebr ssiebr ssiebr iessbr eissbr isesbr siesbr esisbr seisbr sesibr essibr sseibr sseibr essibr sesibr brsesi rbsesi bsresi sbresi rsbesi srbesi bressi rbessi berssi ebrssi rebssi erbssi bsersi sbersi besrsi ebsrsi sebrsi esbrsi rsebsi srebsi resbsi ersbsi serbsi esrbsi brssei rbssei bsrsei sbrsei rsbsei srbsei brssei rbssei bsrsei sbrsei rsbsei srbsei bssrei sbsrei bssrei sbsrei ssbrei ssbrei rssbei srsbei rssbei srsbei ssrbei ssrbei bressi rbessi berssi ebrssi rebssi erbssi brsesi rbsesi bsresi sbresi rsbesi srbesi besrsi ebsrsi bsersi sbersi esbrsi sebrsi resbsi ersbsi rsebsi srebsi esrbsi serbsi bsesri sbesri bessri ebssri sebsri esbsri bsseri sbseri bsseri sbseri ssberi ssberi bessri ebssri bsesri sbesri esbsri sebsri sesbri essbri ssebri ssebri essbri sesbri rsesbi sresbi ressbi erssbi sersbi esrsbi rssebi srsebi rssebi srsebi ssrebi ssrebi ressbi erssbi rsesbi sresbi esrsbi sersbi sesrbi essrbi sserbi sserbi essrbi sesrbi irsesb risesb isresb siresb rsiesb sriesb iressb riessb ierssb eirssb reissb erissb isersb siersb iesrsb eisrsb seirsb esirsb rseisb sreisb resisb ersisb serisb esrisb irsseb risseb isrseb sirseb rsiseb sriseb irsseb risseb isrseb sirseb rsiseb sriseb issreb sisreb issreb sisreb ssireb ssireb rssieb srsieb rssieb srsieb ssrieb ssrieb iressb riessb ierssb eirssb reissb erissb irsesb risesb isresb siresb rsiesb sriesb iesrsb eisrsb isersb siersb esirsb seirsb resisb ersisb rseisb sreisb esrisb serisb isesrb siesrb iessrb eissrb seisrb esisrb isserb siserb isserb siserb ssierb ssierb iessrb eissrb isesrb siesrb esisrb seisrb sesirb essirb sseirb sseirb essirb sesirb rsesib sresib ressib erssib sersib esrsib rsseib srseib rsseib srseib ssreib ssreib ressib erssib rsesib sresib esrsib sersib sesrib essrib sserib sserib essrib sesrib
Note: these 'words' (valid or invalid) are all the permutations of the word birses. These words are obtained by scrambling the letters in birses.