Task: Program Execution
Input (English): I, 5, f, z, b
Output (English): [['I', '5', 'f', 'z'], ['I', '5', 'f', 'b'], ['I', '5', 'z', 'b'], ['I', 'f', 'z', 'b'], ['5', 'f', 'z', 'b']]