sllib lslib sllib lslib llsib llsib slilb lsilb sillb isllb lislb ilslb slilb lsilb sillb isllb lislb ilslb llisb llisb lilsb illsb lilsb illsb sllbi lslbi sllbi lslbi llsbi llsbi slbli lsbli sblli bslli lbsli blsli slbli lsbli sblli bslli lbsli blsli llbsi llbsi lblsi bllsi lblsi bllsi slibl lsibl silbl islbl lisbl ilsbl slbil lsbil sblil bslil lbsil blsil sibll isbll sbill bsill ibsll bisll libsl ilbsl lbisl blisl iblsl bilsl slibl lsibl silbl islbl lisbl ilsbl slbil lsbil sblil bslil lbsil blsil sibll isbll sbill bsill ibsll bisll libsl ilbsl lbisl blisl iblsl bilsl llibs llibs lilbs illbs lilbs illbs llbis llbis lblis bllis lblis bllis libls ilbls lbils blils iblls bills libls ilbls lbils blils iblls bills
Note: these 'words' (valid or invalid) are all the permutations of the word sllib. These words are obtained by scrambling the letters in sllib.