At sea
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At sea
```js var old_arr=[ [1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14] ] ] ], 10]; // 数组拍平 var level_arr=old_arr.flat(4); //数组去重 var Distinct=Array.from(new...