Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given n points on a 2D plane, find if there is such a line parallel to the y-axis that reflects the given points symmetrically.
In other words, answer whether or not if there exists a line that after reflecting all points over the given line, the original points' set is the same as the reflected ones.
Note that there can be repeated points.
 
Please complete the following python code precisely:
```python
class Solution:
    def isReflected(self, points: List[List[int]]) -> bool:
```