How to remove duplicate elements from a list using lists in Dart / Flutter?

Question

How to remove duplicates from a list with lists in Dart / Flutter?

.toSet().toList() doesn't work.

For Example:

List one = [
     [
        [6, 51],
        [2, 76]
     ],
     [
        [6, 51],
        [2, 76]
     ],
     [
        [5, 66],
        [4, 96]
     ]
]

Would be:

List two = [
     [
        [6, 51],
        [2, 76]
     ],
     [
        [5, 66],
        [4, 96]
     ]
]

Solution

I hope this works. Also import 'dart:convert';

List two = 
  one.map((f) => f.toString()).toSet().toList()
  .map((f) => json.decode(f) as List<dynamic>).toList();