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You are given an array 'A' of length 'N'. You can perform the following operation at most once.

```
Choose any element of the array and replace it with 'X', 1 <= 'X' <= 'M'.
```

Return the maximum possible GCD of the array after performing the operation.

```
Let 'N' = 3, 'M' = 5, and 'A' = [4, 3, 2].
We can replace 3 with 2.
The maximum possible GCD is 2.
```

Detailed explanation

```
1 <= 'T' <= 10
1 <= 'N' , 'M' <= 10^5
1 <= 'A[i]' <= 10^5
The Sum of 'N' overall test cases does not exceed 10^5.
Time Limit: 1 sec
```

```
2
4 5
2 5 6 12
2 4
10 15
```

```
2
5
```

```
First test case:-
We can replace 5 with 4.
The maximum possible GCD is 2.
Second test case:-
We do not need to replace any element.
The maximum possible GCD is 5.
```

```
2
5 13
3 4 2 8 7
3 12
4 14 13
```

```
1
2
```