blank lbank balnk ablnk labnk albnk blnak lbnak bnlak nblak lnbak nlbak banlk abnlk bnalk nbalk anblk nablk lanbk alnbk lnabk nlabk anlbk nalbk blakn lbakn balkn ablkn labkn albkn blkan lbkan bklan kblan lkban klban bakln abkln bkaln kbaln akbln kabln lakbn alkbn lkabn klabn aklbn kalbn blnka lbnka bnlka nblka lnbka nlbka blkna lbkna bklna kblna lkbna klbna bnkla nbkla bknla kbnla nkbla knbla lnkba nlkba lknba klnba nklba knlba bankl abnkl bnakl nbakl anbkl nabkl baknl abknl bkanl kbanl akbnl kabnl bnkal nbkal bknal kbnal nkbal knbal ankbl nakbl aknbl kanbl nkabl knabl lankb alnkb lnakb nlakb anlkb nalkb laknb alknb lkanb klanb aklnb kalnb lnkab nlkab lknab klnab nklab knlab anklb naklb aknlb kanlb nkalb knalb
Note: these 'words' (valid or invalid) are all the permutations of the word blank. These words are obtained by scrambling the letters in blank.