Task: Program Execution
Input (English): 7, u, d, 8, m, j
Output (English): [['7', 'u', 'd', '8', 'm'], ['7', 'u', 'd', '8', 'j'], ['7', 'u', 'd', 'm', 'j'], ['7', 'u', '8', 'm', 'j'], ['7', 'd', '8', 'm', 'j'], ['u', 'd', '8', 'm', 'j']]