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문제

The Happy Worm lives in an m x n rectangular field. There are k stones placed in certain locations of the field. (Each square of the field is either empty, or contains a stone.) Whenever the worm sleeps, it lies either horizontally or vertically, and stretches so that its length increases as much as possible.  The worm will not go in a square with a stone or out of the field. The happy worm can not be shorter than 2 squares.

The question you are to answer is how many different positions this worm could be in while sleeping.

입력

The first line of the input file contains a single integer t (1 ≤ t ≤ 11), the number of test cases, followed by the input data for each test case. The first line of each test case contains three integers m, n, and k (1 ≤ m,n,k ≤ 100000). The input for this test case will be followed by k lines. Each line contains two integers which specify the row and column of a stone. No stone will be given twice.

 

출력

There should be one line per test case containing the number of positions the happy worm can be in.

 

예제 입력

1
5 5 6
1 5
2 3
2 4
4 2 
4 3
5 1

예제 출력

9

힌트