copyu ocpyu cpoyu pcoyu opcyu pocyu coypu ocypu cyopu ycopu oycpu yocpu cpyou pcyou cypou ycpou pycou ypcou opycu poycu oypcu yopcu pyocu ypocu copuy ocpuy cpouy pcouy opcuy pocuy coupy ocupy cuopy ucopy oucpy uocpy cpuoy pcuoy cupoy ucpoy pucoy upcoy opucy poucy oupcy uopcy puocy upocy coyup ocyup cyoup ycoup oycup yocup couyp ocuyp cuoyp ucoyp oucyp uocyp cyuop ycuop cuyop ucyop yucop uycop oyucp youcp ouycp uoycp yuocp uyocp cpyuo pcyuo cypuo ycpuo pycuo ypcuo cpuyo pcuyo cupyo ucpyo pucyo upcyo cyupo ycupo cuypo ucypo yucpo uycpo pyuco ypuco puyco upyco yupco uypco opyuc poyuc oypuc yopuc pyouc ypouc opuyc pouyc oupyc uopyc puoyc upoyc oyupc youpc ouypc uoypc yuopc uyopc pyuoc ypuoc puyoc upyoc yupoc uypoc
Note: these 'words' (valid or invalid) are all the permutations of the word copyu. These words are obtained by scrambling the letters in copyu.