Input: nums = [1,4,2,7], low = 2, high = 6 Output: 6 Explanation: All nice pairs (i, j) are as follows: - (0, 1): nums[0] XOR nums[1] = 5 - (0, 2): nums[0] XOR nums[2] = 3 - (0, 3): nums[0] XOR nums[3] = 6 - (1, 2): nums[1] XOR nums[2] = 6 - (1, 3): nums[1] XOR nums[3] = 3 - (2, 3): nums[2] XOR nums[3] = 5

Input: nums = [9,8,4,2,1], low = 5, high = 14 Output: 8 Explanation: All nice pairs (i, j) are as follows: ​​​​​ - (0, 2): nums[0] XOR nums[2] = 13   - (0, 3): nums[0] XOR nums[3] = 11   - (0, 4): nums[0] XOR nums[4] = 8   - (1, 2): nums[1] XOR nums[2] = 12   - (1, 3): nums[1] XOR nums[3] = 10   - (1, 4): nums[1] XOR nums[4] = 9   - (2, 3): nums[2] XOR nums[3] = 6   - (2, 4): nums[2] XOR nums[4] = 5