PROGRAMMING:Values whose Sum is 0

###Input format:
###### The input begins with a single positive integer on a line by itself indicating the number of the cases following, each of them as described below. This line is followed by a blank line, and there is also a blank line between two consecutive inputs.
The first line of the input contains the size of the lists n(this value can be as large as 4000).We then have n lines containing four integer values (with absolute value as large as 2^28) that belong respectively to A,B,C and D.
###Output format:
For each test case, your program has to write the number quadruplets whose sum is zero.The outputs of two consecutive cases will be separated by a blank line.
###Input example:
Here is a set of inputs. For example:
```in
one
six
-45 22 42 -16
-41 -27 56 30
-36 53 -37 77
-36 30 -75 -46
26 -38 -10 62
-32 -54 -6 45
```
###Output example:
Sample Explanation:
Indeed, the sum of the ve following quadruplets is zero: (-45, -27, 42, 30),(26, 30, -10, -46), (-32, 22, 56, -46), (-32, 30, -75, 77), (-32, -54, 56, 30).
```out
five
```







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