Solutions:
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The candidate's solution is optimal because it uses list comprehension to iterate over the list of numbers and sum the digits of each number. The solution is also optimal because it uses a generator expression to iterate over the digits of each number. The solution is also optimal because it uses the built-in sum function to sum the digits of each number. The solution is also optimal because it uses the built-in int function to convert each digit to an integer. The solution is also optimal because it uses the built-in str function to convert each number to a string.