Task: Program Execution
Input (English): u, 3, 4, 7, p, y
Output (English): [['u', '3', '4', '7', 'p'], ['u', '3', '4', '7', 'y'], ['u', '3', '4', 'p', 'y'], ['u', '3', '7', 'p', 'y'], ['u', '4', '7', 'p', 'y'], ['3', '4', '7', 'p', 'y']]