从3个深度嵌套的list - python - sympy中删除重复项

from sympy import *

def remove_duplicates(nested_list):
    new_list = []
    seen = set()
    
    for sublist in nested_list:
        new_sublist = []
        for item in sublist:
            if item not in seen:
                new_sublist.append(item)
                seen.add(item)
        new_list.append(new_sublist)
    
    return new_list

# 示例输入
nested_list = [[1, 2, 3], [2, 3, 4], [3, 4, 5, 5, 6]]

# 调用函数删除重复项
result = remove_duplicates(nested_list)

print(result)

[[1, 2, 3], [4], [5, 6]]