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simona1@sfusd.edu > count3s
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Return the count of the number of times 3 is an element in the list nums.


count3s([2, 4, 5]) → 0
count3s([1, 2, 2, 3, 4, 4, 5]) → 1
count3s([3, 2, 3, 4, 3]) → 3

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def count3s(nums):

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