libnk ilbnk lbink blink iblnk bilnk linbk ilnbk lnibk nlibk inlbk nilbk lbnik blnik lnbik nlbik bnlik nblik ibnlk binlk inblk niblk bnilk nbilk libkn ilbkn lbikn blikn iblkn bilkn likbn ilkbn lkibn klibn iklbn kilbn lbkin blkin lkbin klbin bklin kblin ibkln bikln ikbln kibln bkiln kbiln linkb ilnkb lnikb nlikb inlkb nilkb liknb ilknb lkinb klinb iklnb kilnb lnkib nlkib lknib klnib nklib knlib inklb niklb iknlb kinlb nkilb knilb lbnki blnki lnbki nlbki bnlki nblki lbkni blkni lkbni klbni bklni kblni lnkbi nlkbi lknbi klnbi nklbi knlbi bnkli nbkli bknli kbnli nkbli knbli ibnkl binkl inbkl nibkl bnikl nbikl ibknl biknl ikbnl kibnl bkinl kbinl inkbl nikbl iknbl kinbl nkibl knibl bnkil nbkil bknil kbnil nkbil knbil
Note: these 'words' (valid or invalid) are all the permutations of the word libnk. These words are obtained by scrambling the letters in libnk.