cools ocols cools ocols oocls oocls colos oclos cloos lcoos olcos locos colos oclos cloos lcoos olcos locos oolcs oolcs olocs loocs olocs loocs coosl ocosl coosl ocosl oocsl oocsl cosol ocsol csool scool oscol socol cosol ocsol csool scool oscol socol ooscl ooscl osocl soocl osocl soocl colso oclso closo lcoso olcso locso coslo ocslo csolo scolo osclo soclo clsoo lcsoo csloo scloo lscoo slcoo olsco losco oslco solco lsoco sloco colso oclso closo lcoso olcso locso coslo ocslo csolo scolo osclo soclo clsoo lcsoo csloo scloo lscoo slcoo olsco losco oslco solco lsoco sloco oolsc oolsc olosc loosc olosc loosc ooslc ooslc osolc soolc osolc soolc olsoc losoc osloc soloc lsooc slooc olsoc losoc osloc soloc lsooc slooc
Note: these 'words' (valid or invalid) are all the permutations of the word cools. These words are obtained by scrambling the letters in cools.