flask lfask falsk aflsk lafsk alfsk flsak lfsak fslak sflak lsfak slfak faslk afslk fsalk sfalk asflk saflk lasfk alsfk lsafk slafk aslfk salfk flaks lfaks falks aflks lafks alfks flkas lfkas fklas kflas lkfas klfas fakls afkls fkals kfals akfls kafls lakfs alkfs lkafs klafs aklfs kalfs flska lfska fslka sflka lsfka slfka flksa lfksa fklsa kflsa lkfsa klfsa fskla sfkla fksla kfsla skfla ksfla lskfa slkfa lksfa klsfa sklfa kslfa faskl afskl fsakl sfakl asfkl safkl faksl afksl fkasl kfasl akfsl kafsl fskal sfkal fksal kfsal skfal ksfal askfl sakfl aksfl kasfl skafl ksafl laskf alskf lsakf slakf aslkf salkf laksf alksf lkasf klasf aklsf kalsf lskaf slkaf lksaf klsaf sklaf kslaf asklf saklf akslf kaslf skalf ksalf
Note: these 'words' (valid or invalid) are all the permutations of the word flask. These words are obtained by scrambling the letters in flask.