Solve the programming task below in a Python markdown code block.
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Chef is playing a game where he has an array $A$ of $N$ integers, and an integer $K$. He looks at every subarray of length $K$, and writes its sum on a piece of paper. If a number appears as the sum of multiple subarrays of length $K$, then he only writes down that number once.

Chef is lazy and doesn't like to write numbers. You, being a friend of Chef, want to modify the array such that Chef will only write one number on his paper. In one modification you can choose any index $i$ and replace $A_{i}$ with any integer.

You need to find the minimum number of modifications required.

------ Input ------
The first line contains an integer $T$, the number of test cases. Then the test cases follow.
Each test case contains two lines of input.
The first line contains two space-separated integers $N$, $K$.
The second line contains $N$ space-separated integers $A_{1}, A_{2}, \ldots, A_{N}$.

------ Output ------
For each test case, output the answer in a single line.

------ Constraints  ------
$1 ≤ T ≤ 1000$
$1 ≤ N ≤ 10^{5}$
$1 ≤ K ≤ N$
$1 ≤ A_{i} ≤ 10^{5}$
The sum of $N$ over all test cases does not exceed $5\cdot 10^{5}$.

----- Sample Input 1 ------ 
2

3 3 

1 2 3

2 1

4 6
----- Sample Output 1 ------ 
0

1
----- explanation 1 ------ 
Test Case 1: $K=3$ and there is only one subarray of length $3$, so no changes are required.

Test Case 2: $K=1$ and the subarrays of length $1$ are $[4]$ and $[6]$. So, at least one modification is required. One possible solution with only one modification is to change $A_{2}$ to $4$.