quop uqop qoup oqup uoqp ouqp qupo uqpo qpuo pquo upqo puqo qopu oqpu qpou pqou opqu poqu uopq oupq upoq puoq opuq pouq
Note: these 'words' (valid or invalid) are all the permutations of the word quop. These words are obtained by scrambling the letters in quop.