How to extract sequenced data from an array?

[new_user]

Hi,
having sequenced data array I would like to extract it's unique part.

Let's consider this simple array:

X =
1 2 
1 2
2 2
3 1
2 3
1 2 
1 2
2 2
3 1
2 3
1 2 
1 2
2 2
3 1
2 3

{...}

I would like to get:

Y =
1 2 
1 2
2 2
3 1
2 3

as a result.

Thanks for your time