lutco ultco ltuco tluco utlco tulco lucto ulcto lcuto cluto uclto culto ltcuo tlcuo lctuo cltuo tcluo ctluo utclo tuclo uctlo cutlo tculo ctulo lutoc ultoc ltuoc tluoc utloc tuloc luotc ulotc loutc olutc uoltc oultc ltouc tlouc lotuc oltuc toluc otluc utolc tuolc uotlc outlc toulc otulc lucot ulcot lcuot cluot uclot culot luoct uloct louct oluct uolct oulct lcout clout locut olcut colut oclut ucolt cuolt uoclt ouclt coult ocult ltcou tlcou lctou cltou tclou ctlou ltocu tlocu lotcu oltcu tolcu otlcu lcotu clotu loctu olctu coltu ocltu tcolu ctolu toclu otclu cotlu octlu utcol tucol uctol cutol tcuol ctuol utocl tuocl uotcl outcl toucl otucl ucotl cuotl uoctl ouctl coutl ocutl tcoul ctoul tocul otcul cotul octul
Note: these 'words' (valid or invalid) are all the permutations of the word lutco. These words are obtained by scrambling the letters in lutco.