def handle_order(user, order):
    if user is not None:
        if user.is_active:
            if order.is_valid():
                process_order(order)
                return "Order processed"
            else:
                return "Invalid order"
        else:
            return "Inactive user"
    else:
        return "User not found"

def handle_order(user, order):
    if user is None:
        return "User not found"

    if not user.is_active:
        return "Inactive user"

    if not order.is_valid():
        return "Invalid order"

    process_order(order)
    return "Order processed"