nabks anbks nbaks bnaks abnks banks nakbs ankbs nkabs knabs aknbs kanbs nbkas bnkas nkbas knbas bknas kbnas abkns bakns akbns kabns bkans kbans nabsk anbsk nbask bnask abnsk bansk nasbk ansbk nsabk snabk asnbk sanbk nbsak bnsak nsbak snbak bsnak sbnak absnk basnk asbnk sabnk bsank sbank naksb anksb nkasb knasb aknsb kansb naskb anskb nsakb snakb asnkb sankb nksab knsab nskab snkab ksnab sknab aksnb kasnb asknb saknb ksanb skanb nbksa bnksa nkbsa knbsa bknsa kbnsa nbska bnska nsbka snbka bsnka sbnka nksba knsba nskba snkba ksnba sknba bksna kbsna bskna sbkna ksbna skbna abksn baksn akbsn kabsn bkasn kbasn abskn baskn asbkn sabkn bsakn sbakn aksbn kasbn askbn sakbn ksabn skabn bksan kbsan bskan sbkan ksban skban
Note: these 'words' (valid or invalid) are all the permutations of the word nabks. These words are obtained by scrambling the letters in nabks.