Task: Program Execution
Input (English): 1, f, 7, y, r
Output (English): [['1', 'f', '7', 'y'], ['1', 'f', '7', 'r'], ['1', 'f', 'y', 'r'], ['1', '7', 'y', 'r'], ['f', '7', 'y', 'r']]