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문제

As we all know, all essential systems of a space shuttle are “redundantly replicated” just in case. In the cold and empty space, the key question to a successful navigation is the centuries-old “weremay?” Luckily, in accordance to aforementioned rule, the shuttle’s coordinates can be obtained from three independent sources. These systems provide not only $x$, $y$ and $z$ coordinates, but also the bound $b$ on observational error. The error applies to the distance from point ($x, y, z$), meaning that whenever a system reports ($x, y, z$), the correct shuttle’s coordinates might be any ($x', y', z'$) with $\sqrt{(x - x')^2 + (y - y')^2 + (z - z')^2} \le b$. Truth be told, it’s not easy to determine the shuttle’s position given as many as its three measures. Your task is to determine the volume of the (sub-)space in which the shuttle is possibly contained. At least one of the three systems is intact, but it might be the case that the others are broken.

입력

The input contains several test cases. The first line of the input contains a positive integer $Z \le 10000$, denoting the number of test cases. Then $Z$ test cases follow.

The input instance consists of three lines, each containing a single independent measure. Each measure consists of coordinates $x, y, z \in [−10^9, 10^9]$ and the observational error $b \in [1, 10^9]$ separated by single spaces.

출력

Your program is to print out the volume of the (sub-)space in which the shuttle is possibly contained. Your result is going to be accepted if and only if it is accurate to within a relative or absolute value of at most $10^{-6}$.

예제 입력 1

2
0 0 0 10
19 0 0 10
23 0 0 10
0 0 0 10
12 0 0 10
18 0 0 10

예제 출력 1

9602.0161463094
9334.7189713665