Given an integer array nums and an integer k, return the length of the longest contiguous subarray containing at most k distinct elements that appear at least $2$ times.

Constraints:

• $1 \leq$ nums.length $\leq 10^5$

• $1 \leq$ nums[i] $\leq 10^5$

• $0 \leq$ k $\leq$ nums.length

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