Task: Program Execution
Input (English): W, f, x, d, c, 4
Output (English): [['W', 'f', 'x', 'd', 'c'], ['W', 'f', 'x', 'd', '4'], ['W', 'f', 'x', 'c', '4'], ['W', 'f', 'd', 'c', '4'], ['W', 'x', 'd', 'c', '4'], ['f', 'x', 'd', 'c', '4']]