ZYB has a so-called smart brain: He can always point out the keypoint in a complex problem.

There are two parallel lines AB and CD in a plane.  are all distinct points. 

You only know the Euclidean Distances between . but you don't know the exact order of points. (i.e. You don't know whether it's  or ).

Could you determine the order of points quickly, like the ZYB does?

输入描述:

The input contains multiple cases. The first line of the input contains a single integer , the number of cases.
For each case, there are four integers  in a line, indicating the distances between .
It is guaranteed that each case corresponds to a valid solution.

输出描述:

For each case, output 'AB//CD' (Quotation marks) if , or output 'AB//DC' (Quotation marks) if .

2
3 5 5 3
5 3 3 5

AB//CD
AB//DC