Adjacent Pairs

Let's call an array $b_1, b_2, \dots, b_m$ good, if $b_i \neq b_{i+1}$ for any $i$ with $1 \leq i \leq m-1$. You are given a good array of $n$ positive integers $a_1, a_2, a_3, \dots, a_n$.

You can perform the following operations on this array:

• Choose any index $i$ ($1 \leq i \leq n$) and a number $x$. Then, set $a_i$ to $x$. After this operation, the array has to remain good.

Task

You want to perform several operations so that the resulting array will contain exactly two distinct values. Determine the smallest number of operations needed to achieve this goal.

Input data

The first line of input contains the integer $t$, the number of test cases. The description of test cases follows.

The first line of each test case contains a single integer $n$ — the length of the array.

The second line of each test case contains $n$ integers $a_1, a_2 ,\dots, a_n$ — elements of the array. It's guaranteed that $a_i \neq a_{i+1}$ for $1 \leq i ≤ n − 1$ (that is, the array is good).

It is guaranteed that the sum of $n$ over all test cases does not exceed $2 \cdot 10^5$.

Output data

For each test case, output a single integer — the smallest number of operations needed to achieve an array in which there are exactly two distinct values.

Constraints and clarifications

• $1 \leq t \leq 10^5$
• $2 \leq n \leq 2 \cdot 10^5$
• $1 \leq a \leq n$
• $1 \leq x \leq 10^9$
• For $20$ points, the sum of $n$ over all test cases does not exceed $100$.
• For another $10$ points, the sum of $n$ over all test cases does not exceed $500$.
• For another $25$ points, the sum of $n$ over all test cases does not exceed $4\ 000$.

Example

stdin

2
5
4 5 2 4 5
2
1 2

stdout

3
0

Note

In the first test case, one of the optimal sequences of operations is:
$(4,5,2,4,5) \rightarrow (2,5,2,4,5) \rightarrow (2,5,2,4,2) \rightarrow (2,5,2,5,2)$.

In the second test case, the array already contains only two distinct values, so the answer is $0$.