hasts ahsts hsats shats ashts sahts hatss ahtss htass thass athss tahss hstas shtas htsas thsas sthas tshas asths saths atshs tashs stahs tsahs hasst ahsst hsast shast ashst sahst hasst ahsst hsast shast ashst sahst hssat shsat hssat shsat sshat sshat assht sasht assht sasht ssaht ssaht hatss ahtss htass thass athss tahss hasts ahsts hsats shats ashts sahts htsas thsas hstas shtas tshas sthas atshs tashs asths saths tsahs stahs hstsa shtsa htssa thssa sthsa tshsa hssta shsta hssta shsta sshta sshta htssa thssa hstsa shtsa tshsa sthsa stsha tssha sstha sstha tssha stsha astsh satsh atssh tassh stash tsash assth sasth assth sasth ssath ssath atssh tassh astsh satsh tsash stash stsah tssah sstah sstah tssah stsah
Note: these 'words' (valid or invalid) are all the permutations of the word hasts. These words are obtained by scrambling the letters in hasts.