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Twice counter
         

Given an array of n words. Some words are repeated twice, we need count such words.

Input:
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case contains an integer n denoting the number of words in the string. The next line contains n space separated words forming the string.

Output:
Print the count of the words which are repeated twice in the string.

Constraints:
1<=T<=10^5
1<=no of words<=10^5
1<=length of each word<=10^5

Example:
Input:
2
10
hate love peace love peace hate love peace love peace
8
Tom Jerry Thomas Tom Jerry Courage Tom Courage

Output:
1
2

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

Contributor: Ayush Govil

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