sectr esctr scetr csetr ecstr cestr setcr estcr stecr tsecr etscr tescr scter cster stcer tscer ctser tcser ectsr cetsr etcsr tecsr ctesr tcesr secrt escrt scert csert ecsrt cesrt serct esrct srect rsect ersct resct scret csret srcet rscet crset rcset ecrst cerst ercst recst crest rcest setrc estrc sterc tserc etsrc tesrc sertc esrtc sretc rsetc erstc restc strec tsrec srtec rstec trsec rtsec etrsc tersc ertsc retsc tresc rtesc sctre cstre stcre tscre ctsre tcsre scrte csrte srcte rscte crste rcste strce tsrce srtce rstce trsce rtsce ctrse tcrse crtse rctse trcse rtcse ectrs cetrs etcrs tecrs cters tcers ecrts certs ercts rects crets rcets etrcs tercs ertcs retcs trecs rtecs ctres tcres crtes rctes trces rtces
Note: these 'words' (valid or invalid) are all the permutations of the word sectr. These words are obtained by scrambling the letters in sectr.