class Solution:
    def fourSum(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[List[int]]
        """
        nums = sorted(nums)
        res = []
        for i in range(len(nums)-3):
            for j in range(i+1, len(nums)-2):
                t = target - nums[i]- nums[j]
                k,l = j+1, len(nums)-1
                while k<l:
                    if nums[k]+nums[l]==t:
                        if tuple([nums[i],nums[j],nums[k],nums[l]]) not in res:
                            res += [tuple([nums[i],nums[j],nums[k],nums[l]])]
                        k+=1
                    elif nums[k]+nums[l]<t:
                        k+=1
                    else:
                        l-=1
        return [list(c) for c in set(res)]