bolls oblls blols lbols olbls lobls bolls oblls blols lbols olbls lobls bllos lblos bllos lblos llbos llbos ollbs lolbs ollbs lolbs llobs llobs bolsl oblsl blosl lbosl olbsl lobsl bosll obsll bsoll sboll osbll sobll blsol lbsol bslol sblol lsbol slbol olsbl losbl oslbl solbl lsobl slobl bolsl oblsl blosl lbosl olbsl lobsl bosll obsll bsoll sboll osbll sobll blsol lbsol bslol sblol lsbol slbol olsbl losbl oslbl solbl lsobl slobl bllso lblso bllso lblso llbso llbso blslo lbslo bsllo sbllo lsblo slblo blslo lbslo bsllo sbllo lsblo slblo llsbo llsbo lslbo sllbo lslbo sllbo ollsb lolsb ollsb lolsb llosb llosb olslb loslb osllb sollb lsolb slolb olslb loslb osllb sollb lsolb slolb llsob llsob lslob sllob lslob sllob
Note: these 'words' (valid or invalid) are all the permutations of the word bolls. These words are obtained by scrambling the letters in bolls.