sbert bsert sebrt esbrt besrt ebsrt sbret bsret srbet rsbet brset rbset serbt esrbt srebt rsebt ersbt resbt berst ebrst brest rbest erbst rebst sbetr bsetr sebtr esbtr bestr ebstr sbter bster stber tsber btser tbser setbr estbr stebr tsebr etsbr tesbr betsr ebtsr btesr tbesr etbsr tebsr sbrte bsrte srbte rsbte brste rbste sbtre bstre stbre tsbre btsre tbsre srtbe rstbe strbe tsrbe rtsbe trsbe brtse rbtse btrse tbrse rtbse trbse sertb esrtb sretb rsetb erstb restb setrb estrb sterb tserb etsrb tesrb srteb rsteb streb tsreb rtseb trseb ertsb retsb etrsb tersb rtesb tresb berts ebrts brets rbets erbts rebts betrs ebtrs bters tbers etbrs tebrs brtes rbtes btres tbres rtbes trbes ertbs retbs etrbs terbs rtebs trebs
Note: these 'words' (valid or invalid) are all the permutations of the word sbert. These words are obtained by scrambling the letters in sbert.