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While validating event samples from Nutanix Prism Central, identify the value that appears least often in an array. Return the first value encountered when multiple values share the minimum frequency.
Implement find_least_frequent(nums), where nums is a non-empty list of integers. Return the integer with the smallest frequency in nums. If several integers have the same minimum frequency, return the one whose first occurrence has the smallest index.
The input array must not be modified.
def find_least_frequent(nums):