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```Given the map of BTS consists of N x M cells. Each cell in map have a cost and can connect to other 6 cells around it. Two cells are connected if they share a same edge.
We call a group of 4 connected cells a cluster. Your program should find the cluster with highest cost sum and print out the square value of its sum
Ex: M = 5 , N = 3

In above example, we have a cluster with square of sum
(300 + 410 + 185 + 95)2 = 980100

In above example, the selected cells is not a cluster.

[Input]
- The first line is the number of test cases T (T <= 50)
- In each TC :
+ The first line give the size of the map M, N ( 3 ≤ N, M ≤ 15 )
+ In the next N lines, the cost C (0 ≤ C ≤ 1000) of each cell is given as below rule

5
5 3
300 410 150 55 370
120 185 440 190 450
165 70 95 420 50
5 5
356 55 41 453 12
401 506 274 506 379
360 281 421 311 489
425 74 276 371 164
138 528 461 477 470

[Output]
Print out the square value of maximum cluster's sum
Case #1
2250000
Case #2
3748096
Case #3
3928324
Case #4
7236100
Case #5
13104400

```