Given a linked list, the task is to complete the function maxPalindrome which returns an integer denoting  the length of the longest palindrome list that exist in the given linked list.

Examples:

Input  : List = 2->3->7->3->2->12->24
Output : 5
The longest palindrome list is 2->3->7->3->2

Input  : List = 12->4->4->3->14
Output : 2
The longest palindrome list is 4->4

Input:
The first line of input contains an integer T denotingo the no of test cases. Then T test cases follow. The first line of each test case contains an integer N denoting the size of the linked list . Then in the next line are N space separated values of the given linked list.

Output:
For each test case output will be the required max length of the palindrome present in the given linked list.

Constraints:
1<=T<=100
1<=N<=100

Example(To be used only for expected output):
Input:
2
7
2 3 7 3 2 12 24
5
12 4 4 3 14
Output:
5
2


Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **