smack msack samck asmck masck amsck smcak mscak scmak csmak mcsak cmsak sacmk ascmk scamk csamk acsmk casmk macsk amcsk mcask cmask acmsk camsk smakc msakc samkc asmkc maskc amskc smkac mskac skmac ksmac mksac kmsac sakmc askmc skamc ksamc aksmc kasmc maksc amksc mkasc kmasc akmsc kamsc smcka mscka scmka csmka mcska cmska smkca mskca skmca ksmca mksca kmsca sckma cskma skcma kscma cksma kcsma mcksa cmksa mkcsa kmcsa ckmsa kcmsa sackm asckm scakm csakm acskm caskm sakcm askcm skacm ksacm akscm kascm sckam cskam skcam kscam cksam kcsam acksm caksm akcsm kacsm ckasm kcasm macks amcks mcaks cmaks acmks camks makcs amkcs mkacs kmacs akmcs kamcs mckas cmkas mkcas kmcas ckmas kcmas ackms cakms akcms kacms ckams kcams
Note: these 'words' (valid or invalid) are all the permutations of the word smack. These words are obtained by scrambling the letters in smack.