certes ecrtes cretes rcetes erctes rectes cetres ectres cteres tceres etcres tecres crtees rctees ctrees tcrees rtcees trcees ertces retces etrces terces rteces treces cerets ecrets creets rceets ercets recets ceerts ecerts ceerts ecerts eecrts eecrts creets rceets cerets ecrets recets ercets erects reects eercts eercts reects erects ceters ecters cteers tceers etcers tecers ceetrs ecetrs ceetrs ecetrs eectrs eectrs cteers tceers ceters ecters tecers etcers etecrs teecrs eetcrs eetcrs teecrs etecrs crtees rctees ctrees tcrees rtcees trcees cretes rcetes certes ecrtes rectes erctes cteres tceres cetres ectres tecres etcres rteces treces retces ertces terces etrces ertecs retecs etrecs terecs rteecs treecs eretcs reetcs eertcs eertcs reetcs eretcs etercs teercs eetrcs eetrcs teercs etercs rteecs treecs retecs ertecs terecs etrecs certse ecrtse cretse rcetse erctse rectse cetrse ectrse cterse tcerse etcrse tecrse crtese rctese ctrese tcrese rtcese trcese ertcse retcse etrcse tercse rtecse trecse cerste ecrste creste rceste ercste recste cesrte ecsrte cserte scerte escrte secrte crsete rcsete csrete screte rscete srcete erscte rescte esrcte sercte rsecte srecte cetsre ectsre ctesre tcesre etcsre tecsre cestre ecstre csetre scetre esctre sectre ctsere tcsere cstere sctere tscere stcere etscre tescre estcre setcre tsecre stecre crtsee rctsee ctrsee tcrsee rtcsee trcsee crstee rcstee csrtee scrtee rsctee srctee ctsree tcsree cstree sctree tscree stcree rtscee trscee rstcee srtcee tsrcee strcee ertsce retsce etrsce tersce rtesce tresce erstce restce esrtce sertce rsetce sretce etsrce tesrce estrce setrce tserce sterce rtsece trsece rstece srtece tsrece strece cerest ecrest creest rceest ercest recest ceerst ecerst ceerst ecerst eecrst eecrst creest rceest cerest ecrest recest ercest erecst reecst eercst eercst reecst erecst cerset ecrset creset rceset ercset recset cesret ecsret cseret sceret escret secret crseet rcseet csreet screet rsceet srceet erscet rescet esrcet sercet rsecet srecet ceesrt ecesrt ceesrt ecesrt eecsrt eecsrt cesert ecsert cseert sceert escert secert cesert ecsert cseert sceert escert secert eescrt eescrt esecrt seecrt esecrt seecrt creset rceset cerset ecrset recset ercset crseet rcseet csreet screet rsceet srceet cesret ecsret cseret sceret escret secret rescet erscet rsecet srecet esrcet sercet eresct reesct eersct eersct reesct eresct ersect resect esrect serect rseect sreect eesrct eesrct eserct seerct eserct seerct resect ersect rseect sreect esrect serect cetesr ectesr cteesr tceesr etcesr tecesr ceetsr ecetsr ceetsr ecetsr eectsr eectsr cteesr tceesr cetesr ectesr tecesr etcesr etecsr teecsr eetcsr eetcsr teecsr etecsr cetser ectser cteser tceser etcser tecser cester ecster cseter sceter escter secter ctseer tcseer csteer scteer tsceer stceer etscer tescer estcer setcer tsecer stecer ceestr ecestr ceestr ecestr eecstr eecstr cesetr ecsetr cseetr sceetr escetr secetr cesetr ecsetr cseetr sceetr escetr secetr eesctr eesctr esectr seectr esectr seectr cteser tceser cetser ectser tecser etcser ctseer tcseer csteer scteer tsceer stceer cester ecster cseter sceter escter secter tescer etscer tsecer stecer estcer setcer etescr teescr eetscr eetscr teescr etescr etsecr tesecr estecr setecr tseecr steecr eestcr eestcr esetcr seetcr esetcr seetcr tesecr etsecr tseecr steecr estecr setecr crtese rctese ctrese tcrese rtcese trcese cretse rcetse certse ecrtse rectse erctse cterse tcerse cetrse ectrse tecrse etcrse rtecse trecse retcse ertcse tercse etrcse crtsee rctsee ctrsee tcrsee rtcsee trcsee crstee rcstee csrtee scrtee rsctee srctee ctsree tcsree cstree sctree tscree stcree rtscee trscee rstcee srtcee tsrcee strcee creste rceste cerste ecrste recste ercste crsete rcsete csrete screte rscete srcete cesrte ecsrte cserte scerte escrte secrte rescte erscte rsecte srecte esrcte sercte ctesre tcesre cetsre ectsre tecsre etcsre ctsere tcsere cstere sctere tscere stcere cestre ecstre csetre scetre esctre sectre tescre etscre tsecre stecre estcre setcre rtesce tresce retsce ertsce tersce etrsce rtsece trsece rstece srtece tsrece strece restce erstce rsetce sretce esrtce sertce tesrce etsrce tserce sterce estrce setrce ertesc retesc etresc teresc rteesc treesc eretsc reetsc eertsc eertsc reetsc eretsc etersc teersc eetrsc eetrsc teersc etersc rteesc treesc retesc ertesc teresc etresc ertsec retsec etrsec tersec rtesec tresec erstec restec esrtec sertec rsetec sretec etsrec tesrec estrec setrec tserec sterec rtseec trseec rsteec srteec tsreec streec erestc reestc eerstc eerstc reestc erestc ersetc resetc esretc seretc rseetc sreetc eesrtc eesrtc esertc seertc esertc seertc resetc ersetc rseetc sreetc esretc seretc etesrc teesrc eetsrc eetsrc teesrc etesrc etserc teserc esterc seterc tseerc steerc eestrc eestrc esetrc seetrc esetrc seetrc teserc etserc tseerc steerc esterc seterc rtesec tresec retsec ertsec tersec etrsec rtseec trseec rsteec srteec tsreec streec restec erstec rsetec sretec esrtec sertec tesrec etsrec tserec sterec estrec setrec
Note: these 'words' (valid or invalid) are all the permutations of the word certes. These words are obtained by scrambling the letters in certes.