Given a singly linked list consisting of N nodes. The task is to remove duplicates (nodes with duplicate values) from the given list (if exists).
Note: Try not to use extra space. Expected time complexity is O(N). The nodes are arranged in a sorted way.

First line of input contains number of testcases T. For each testcase, first line of input contains length of linked list and next line contains the linked list data.

For each testcase, there will be a single line of output which contains linked list with no duplicates.

User Task:
The task is to complete the function removeDuplicates() which should remove the duplicates from linked list. The printing is done automatically by the driver code.

1 <= T <= 100
1 <= N <= 104

2 2 4 5
2 2 2 2 2

2 4 5

Testcase 1:
In the given linked list 2 ->2 -> 4-> 5, only 2 occurs more than 1 time.
Testcase 2: In the given linked list 2 ->2 ->2 ->2 ->2, 2 is the only element and is repeated 5 times.


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

Contributor: Amit Khandelwal, Harshit Sidhwa
Author: Shubham Joshi 1

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