Task: Program Execution
Input (English): X, 4, 8, 2, F, C
Output (English): [['X', '4', '8', '2', 'F'], ['X', '4', '8', '2', 'C'], ['X', '4', '8', 'F', 'C'], ['X', '4', '2', 'F', 'C'], ['X', '8', '2', 'F', 'C'], ['4', '8', '2', 'F', 'C']]