Please generate comments for the following function:
def mostFrequentEven(self, nums: List[int]) -> int:
    ans = -1
    cnt = 0
    for k, v in Counter(nums).items():
        if k % 2 == 0 and (v > cnt or v == cnt and k < ans):
            ans = k
            cnt = v
return ans In your entire response, the letter r should appear less than 5.
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