trsab rtsab tsrab strab rstab srtab trasb rtasb tarsb atrsb ratsb artsb tsarb starb tasrb atsrb satrb astrb rsatb sratb rastb arstb sartb asrtb trsba rtsba tsrba strba rstba srtba trbsa rtbsa tbrsa btrsa rbtsa brtsa tsbra stbra tbsra btsra sbtra bstra rsbta srbta rbsta brsta sbrta bsrta trabs rtabs tarbs atrbs ratbs artbs trbas rtbas tbras btras rbtas brtas tabrs atbrs tbars btars abtrs batrs rabts arbts rbats brats abrts barts tsabr stabr tasbr atsbr satbr astbr tsbar stbar tbsar btsar sbtar bstar tabsr atbsr tbasr btasr abtsr batsr sabtr asbtr sbatr bsatr abstr bastr rsabt srabt rasbt arsbt sarbt asrbt rsbat srbat rbsat brsat sbrat bsrat rabst arbst rbast brast abrst barst sabrt asbrt sbart bsart absrt basrt
Note: these 'words' (valid or invalid) are all the permutations of the word trsab. These words are obtained by scrambling the letters in trsab.