Task: Program Execution
Input (English): y, o, 7, X, 4, X
Output (English): [['y', 'o', '7', 'X', '4'], ['y', 'o', '7', 'X', 'X'], ['y', 'o', '7', '4', 'X'], ['y', 'o', 'X', '4', 'X'], ['y', '7', 'X', '4', 'X'], ['o', '7', 'X', '4', 'X']]