Task: Program Execution
Input (English): 1, x, H, 8, u
Output (English): [['1', 'x', 'H', '8'], ['1', 'x', 'H', 'u'], ['1', 'x', '8', 'u'], ['1', 'H', '8', 'u'], ['x', 'H', '8', 'u']]