qrei rqei qeri eqri reqi erqi qrie rqie qire iqre riqe irqe qeir eqir qier iqer eiqr ieqr reiq eriq rieq ireq eirq ierq
Note: these 'words' (valid or invalid) are all the permutations of the word qrei. These words are obtained by scrambling the letters in qrei.