Given N and E, the number of nodes and edges in a directed graph. The task is to do Breadth First Search of this graph.

Input:
The first line of input contains the number of test cases T. For each test case, the first line of input contains N and E separated by space, and next line contains 2*N numbers (N pairs as X Y) are given in the next line which represents an edge from X to Y.

Output:
For each testcase, print the BFS of the graph starting from 0.

Note: The expected output button always produces BFS starting from node 0.

User Task:
Since, this is a functional problem, your task is to complete the function bfs() which do BFS of the given graph starting from node 0 and prints the nodes in BFS order.

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

Example:
Input:
2
5 4
0 1 0 2 0 3 2 4
3 2
0 1 0 2

Output:
0 1 2 3 4    // BFS from node 0
0 1 2

Explanation:
Testcase 1: First line of each test case represent an integer N denoting number of nodes and edges and then in the next line N pairs of values a and b are fed which denotes there is a unidirectional edge from a to b .
 

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