Given an array of integers nums and an integer k, return the number of contiguous subarrays where the bitwise AND of all elements in the subarray equals k.

Note: A subarray is a contiguous non empty sequence of elements within an array.

Constraints:

• $1 \leq$ nums.length $\leq 10^5$

• $0 \leq$ nums[i], k $\leq 10^9$

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