Task: Program Execution
Input (English): f, V, I, O, X
Output (English): [['f', 'V', 'I', 'O'], ['f', 'V', 'I', 'X'], ['f', 'V', 'O', 'X'], ['f', 'I', 'O', 'X'], ['V', 'I', 'O', 'X']]