Task: Program Execution
Input (English): f, 4, I, 0, T, U, 6
Output (English): [['f', '4', 'I', '0', 'T', 'U'], ['f', '4', 'I', '0', 'T', '6'], ['f', '4', 'I', '0', 'U', '6'], ['f', '4', 'I', 'T', 'U', '6'], ['f', '4', '0', 'T', 'U', '6'], ['f', 'I', '0', 'T', 'U', '6'], ['4', 'I', '0', 'T', 'U', '6']]