如何生成一个具有重复的序列的每个排列的数组？

def generate_permutations(nums):
    result = []
    permute(nums, 0, result)
    return result

def permute(nums, start, result):
    if start == len(nums):
        result.append(nums[:])
        return

    visited = set()
    for i in range(start, len(nums)):
        if nums[i] in visited:
            continue
        visited.add(nums[i])
        nums[start], nums[i] = nums[i], nums[start]
        permute(nums, start + 1, result)
        nums[start], nums[i] = nums[i], nums[start]

# 示例用法
nums = [1, 2, 2]
permutations = generate_permutations(nums)
print(permutations)