| Вход | Ожидаемый результат |
|---|---|
| [[[1, 2, 3], [2, 3, 4], [3, 4, 5]]] | [3] |
| [[[1, 2], [1, 2]]] | [1, 2] |
| [[[1], [2], [3]]] | [] |
| [[[1, 2, 3]]] | [1, 2, 3] |
| [[[5, 6, 7], [6, 7, 8], [7, 8, 9], [7]]] | [7] |
| [[[1, 2, 3, 4], [2, 3, 4], [3, 4]]] | [3, 4] |
| [[[0], [0], [0], [0]]] | [0] |
| [[[1, 2], [3, 4]]] | [] |
| [[[10, 20, 30], [10, 20], [10]]] | [10] |
| [[[1, 2, 3], [1, 2, 3], [1, 2, 3]]] | [1, 2, 3] |