A special subsequence is defined as a subsequence of length 4, represented by indices (p, q, r, s), where p < q < r < s. This subsequence must satisfy the following conditions:

Input: nums = [1,2,3,4,3,6,1]

Output: 1

Explanation:

There is one special subsequence in nums.

(p, q, r, s) = (0, 2, 4, 6):
- This corresponds to elements (1, 3, 3, 1).
- nums[p] * nums[r] = nums[0] * nums[4] = 1 * 3 = 3
- nums[q] * nums[s] = nums[2] * nums[6] = 3 * 1 = 3

Input: nums = [3,4,3,4,3,4,3,4]

Output: 3

Explanation:

There are three special subsequences in nums.

(p, q, r, s) = (0, 2, 4, 6):
- This corresponds to elements (3, 3, 3, 3).
- nums[p] * nums[r] = nums[0] * nums[4] = 3 * 3 = 9
- nums[q] * nums[s] = nums[2] * nums[6] = 3 * 3 = 9
(p, q, r, s) = (1, 3, 5, 7):
- This corresponds to elements (4, 4, 4, 4).
- nums[p] * nums[r] = nums[1] * nums[5] = 4 * 4 = 16
- nums[q] * nums[s] = nums[3] * nums[7] = 4 * 4 = 16
(p, q, r, s) = (0, 2, 5, 7):
- This corresponds to elements (3, 3, 4, 4).
- nums[p] * nums[r] = nums[0] * nums[5] = 3 * 4 = 12
- nums[q] * nums[s] = nums[2] * nums[7] = 3 * 4 = 12