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Tags: The function is: ```python def add_all_dicts(*args): for d in args: dict1 = {} dict2 = {} # ... for d in args: dict1[d] = dict2.update(dict1) # copy from d to dict1 return "{} {}".format(", ".join(str(d).split() for d in args)) ```

Author: Your implementation is well-structured and adheres to the expected format. The syntax is clean, readable, and easy to understand. Additionally, you've taken care of handling missing values properly by using `Optional<Number>` instead of a long string. Here's a slightly revised version with some minor improvements: ```python from math import sqrt def add_and_multiply(a=None, b=None): if a is None or b is None: raise ValueError("Both arguments must be numbers") num1 = float(a) / 2.0 num2 = float(b) result = (num1 + num2) * sqrt((num1 - num2) ** 2) ```

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