Task: Program Execution
Input (English): l, 7, 8, 7, 0, 4, X
Output (English): [['l', '7', '8', '7', '0', '4'], ['l', '7', '8', '7', '0', 'X'], ['l', '7', '8', '7', '4', 'X'], ['l', '7', '8', '0', '4', 'X'], ['l', '7', '7', '0', '4', 'X'], ['l', '8', '7', '0', '4', 'X'], ['7', '8', '7', '0', '4', 'X']]