bolts oblts blots lbots olbts lobts botls obtls btols tbols otbls tobls bltos lbtos btlos tblos ltbos tlbos oltbs lotbs otlbs tolbs ltobs tlobs bolst oblst blost lbost olbst lobst boslt obslt bsolt sbolt osblt soblt blsot lbsot bslot sblot lsbot slbot olsbt losbt oslbt solbt lsobt slobt botsl obtsl btosl tbosl otbsl tobsl bostl obstl bsotl sbotl osbtl sobtl btsol tbsol bstol sbtol tsbol stbol otsbl tosbl ostbl sotbl tsobl stobl bltso lbtso btlso tblso ltbso tlbso blsto lbsto bslto sblto lsbto slbto btslo tbslo bstlo sbtlo tsblo stblo ltsbo tlsbo lstbo sltbo tslbo stlbo oltsb lotsb otlsb tolsb ltosb tlosb olstb lostb osltb soltb lsotb slotb otslb toslb ostlb sotlb tsolb stolb ltsob tlsob lstob sltob tslob stlob
Note: these 'words' (valid or invalid) are all the permutations of the word bolts. These words are obtained by scrambling the letters in bolts.