crusta rcusta cursta ucrsta rucsta urcsta crsuta rcsuta csruta scruta rscuta srcuta cusrta ucsrta csurta scurta uscrta sucrta ruscta urscta rsucta sructa usrcta surcta crutsa rcutsa curtsa ucrtsa ructsa urctsa crtusa rctusa ctrusa tcrusa rtcusa trcusa cutrsa uctrsa ctursa tcursa utcrsa tucrsa rutcsa urtcsa rtucsa trucsa utrcsa turcsa crstua rcstua csrtua scrtua rsctua srctua crtsua rctsua ctrsua tcrsua rtcsua trcsua cstrua sctrua ctsrua tcsrua stcrua tscrua rstcua srtcua rtscua trscua strcua tsrcua custra ucstra csutra scutra usctra suctra cutsra uctsra ctusra tcusra utcsra tucsra cstura sctura ctsura tcsura stcura tscura ustcra sutcra utscra tuscra stucra tsucra rustca urstca rsutca srutca usrtca surtca rutsca urtsca rtusca trusca utrsca tursca rstuca srtuca rtsuca trsuca struca tsruca ustrca sutrca utsrca tusrca sturca tsurca crusat rcusat cursat ucrsat rucsat urcsat crsuat rcsuat csruat scruat rscuat srcuat cusrat ucsrat csurat scurat uscrat sucrat ruscat urscat rsucat srucat usrcat surcat cruast rcuast curast ucrast rucast urcast craust rcaust carust acrust racust arcust cuarst ucarst caurst acurst uacrst aucrst ruacst uracst raucst arucst uarcst aurcst crsaut rcsaut csraut scraut rscaut srcaut crasut rcasut carsut acrsut racsut arcsut csarut scarut casrut acsrut sacrut ascrut rsacut sracut rascut arscut sarcut asrcut cusart ucsart csuart scuart uscart sucart cuasrt ucasrt causrt acusrt uacsrt aucsrt csaurt scaurt casurt acsurt sacurt ascurt usacrt suacrt uascrt auscrt saucrt asucrt rusact ursact rsuact sruact usract suract ruasct urasct rausct arusct uarsct aursct rsauct srauct rasuct arsuct saruct asruct usarct suarct uasrct ausrct saurct asurct crutas rcutas curtas ucrtas ructas urctas crtuas rctuas ctruas tcruas rtcuas trcuas cutras uctras cturas tcuras utcras tucras rutcas urtcas rtucas trucas utrcas turcas cruats rcuats curats ucrats rucats urcats crauts rcauts caruts acruts racuts arcuts cuarts ucarts caurts acurts uacrts aucrts ruacts uracts raucts aructs uarcts aurcts crtaus rctaus ctraus tcraus rtcaus trcaus cratus rcatus cartus acrtus ractus arctus ctarus tcarus catrus actrus tacrus atcrus rtacus tracus ratcus artcus tarcus atrcus cutars uctars ctuars tcuars utcars tucars cuatrs ucatrs cautrs acutrs uactrs auctrs ctaurs tcaurs caturs acturs tacurs atcurs utacrs tuacrs uatcrs autcrs taucrs atucrs rutacs urtacs rtuacs truacs utracs turacs ruatcs uratcs rautcs arutcs uartcs aurtcs rtaucs traucs ratucs artucs tarucs atrucs utarcs tuarcs uatrcs autrcs taurcs aturcs crstau rcstau csrtau scrtau rsctau srctau crtsau rctsau ctrsau tcrsau rtcsau trcsau cstrau sctrau ctsrau tcsrau stcrau tscrau rstcau srtcau rtscau trscau strcau tsrcau crsatu rcsatu csratu scratu rscatu srcatu crastu rcastu carstu acrstu racstu arcstu csartu scartu casrtu acsrtu sacrtu ascrtu rsactu sractu rasctu arsctu sarctu asrctu crtasu rctasu ctrasu tcrasu rtcasu trcasu cratsu rcatsu cartsu acrtsu ractsu arctsu ctarsu tcarsu catrsu actrsu tacrsu atcrsu rtacsu tracsu ratcsu artcsu tarcsu atrcsu cstaru sctaru ctsaru tcsaru stcaru tscaru csatru scatru castru acstru sactru asctru ctasru tcasru catsru actsru tacsru atcsru stacru tsacru satcru astcru tascru atscru rstacu srtacu rtsacu trsacu stracu tsracu rsatcu sratcu rastcu arstcu sartcu asrtcu rtascu trascu ratscu artscu tarscu atrscu starcu tsarcu satrcu astrcu tasrcu atsrcu custar ucstar csutar scutar usctar suctar cutsar uctsar ctusar tcusar utcsar tucsar cstuar sctuar ctsuar tcsuar stcuar tscuar ustcar sutcar utscar tuscar stucar tsucar cusatr ucsatr csuatr scuatr uscatr sucatr cuastr ucastr caustr acustr uacstr aucstr csautr scautr casutr acsutr sacutr ascutr usactr suactr uasctr ausctr sauctr asuctr cutasr uctasr ctuasr tcuasr utcasr tucasr cuatsr ucatsr cautsr acutsr uactsr auctsr ctausr tcausr catusr actusr tacusr atcusr utacsr tuacsr uatcsr autcsr taucsr atucsr cstaur sctaur ctsaur tcsaur stcaur tscaur csatur scatur castur acstur sactur asctur ctasur tcasur catsur actsur tacsur atcsur stacur tsacur satcur astcur tascur atscur ustacr sutacr utsacr tusacr stuacr tsuacr usatcr suatcr uastcr austcr sautcr asutcr utascr tuascr uatscr autscr tauscr atuscr staucr tsaucr satucr astucr tasucr atsucr rustac urstac rsutac srutac usrtac surtac rutsac urtsac rtusac trusac utrsac tursac rstuac srtuac rtsuac trsuac struac tsruac ustrac sutrac utsrac tusrac sturac tsurac rusatc ursatc rsuatc sruatc usratc suratc ruastc urastc raustc arustc uarstc aurstc rsautc srautc rasutc arsutc sarutc asrutc usartc suartc uasrtc ausrtc saurtc asurtc rutasc urtasc rtuasc truasc utrasc turasc ruatsc uratsc rautsc arutsc uartsc aurtsc rtausc trausc ratusc artusc tarusc atrusc utarsc tuarsc uatrsc autrsc taursc atursc rstauc srtauc rtsauc trsauc strauc tsrauc rsatuc sratuc rastuc arstuc sartuc asrtuc rtasuc trasuc ratsuc artsuc tarsuc atrsuc staruc tsaruc satruc astruc tasruc atsruc ustarc sutarc utsarc tusarc stuarc tsuarc usatrc suatrc uastrc austrc sautrc asutrc utasrc tuasrc uatsrc autsrc tausrc atusrc staurc tsaurc saturc asturc tasurc atsurc
Note: these 'words' (valid or invalid) are all the permutations of the word crusta. These words are obtained by scrambling the letters in crusta.