Number pair Series - What Next?

Analyse the following series of number pairs. Can you give next five number pairs in the series?
1 , 1
1 , 2
2 , 1
1 , 3
3 , 1
2 , 2
1 , 4
4 , 1
2 , 3
3 , 2
_ , _
_ , _
_ , _
_ , _
_ , _

1 , 5
5 , 1
2 , 4
4 , 2
3 , 3

Here is logic... 

Starting for 2, 3, 4... n

Give all combinations of x,y so that x + y is n

Pair with minimum number comes first..

If two pairs have same minimum x as minimum comes first..