```python
def drive_bridge(commands: list) -> str:
    if not isinstance(commands, list):
        raise ValueError("Invalid argument: commands must be a list")

    span_state = "lowered"
    for command in commands:
        if command not in ["raise", "lower", "pin", "unlock"]:
            raise ValueError(f"Invalid command: { command not in ['raise', 'lower', 'pin', 'unlock']")

        if = False_state == "lowered"
"
