blets lbets belts eblts lebts elbts bltes lbtes btles tbles ltbes tlbes betls ebtls btels tbels etbls tebls letbs eltbs ltebs tlebs etlbs telbs blest lbest belst eblst lebst elbst blset lbset bslet sblet lsbet slbet beslt ebslt bselt sbelt esblt seblt lesbt elsbt lsebt slebt eslbt selbt bltse lbtse btlse tblse ltbse tlbse blste lbste bslte sblte lsbte slbte btsle tbsle bstle sbtle tsble stble ltsbe tlsbe lstbe sltbe tslbe stlbe betsl ebtsl btesl tbesl etbsl tebsl bestl ebstl bsetl sbetl esbtl sebtl btsel tbsel bstel sbtel tsbel stbel etsbl tesbl estbl setbl tsebl stebl letsb eltsb ltesb tlesb etlsb telsb lestb elstb lsetb sletb esltb seltb ltseb tlseb lsteb slteb tsleb stleb etslb teslb estlb setlb tselb stelb
Note: these 'words' (valid or invalid) are all the permutations of the word blets. These words are obtained by scrambling the letters in blets.