bilks iblks bliks lbiks ilbks libks bikls ibkls bkils kbils ikbls kibls blkis lbkis bklis kblis lkbis klbis ilkbs likbs iklbs kilbs lkibs klibs bilsk iblsk blisk lbisk ilbsk libsk bislk ibslk bsilk sbilk isblk siblk blsik lbsik bslik sblik lsbik slbik ilsbk lisbk islbk silbk lsibk slibk biksl ibksl bkisl kbisl ikbsl kibsl biskl ibskl bsikl sbikl isbkl sibkl bksil kbsil bskil sbkil ksbil skbil iksbl kisbl iskbl sikbl ksibl skibl blksi lbksi bklsi kblsi lkbsi klbsi blski lbski bslki sblki lsbki slbki bksli kbsli bskli sbkli ksbli skbli lksbi klsbi lskbi slkbi kslbi sklbi ilksb liksb iklsb kilsb lkisb klisb ilskb liskb islkb silkb lsikb slikb ikslb kislb isklb siklb ksilb skilb lksib klsib lskib slkib kslib sklib
Note: these 'words' (valid or invalid) are all the permutations of the word bilks. These words are obtained by scrambling the letters in bilks.