#include <iostream>
#include <fstream>

using namespace std;

int t,i,j,k,l;
int o,p,q;
int n,m;
int a[301][301];
bool b;

int main()
{
	ifstream fin("line.in");
	ofstream fout("line.out");
	
	fin>>t;
	for (l=1;l<=t;l++)
	{
		b=false;
		fin>>n>>m;
		for (i=1;i<=n;i++)
			for (j=1;j<=n;j++)
				a[i][j]=2;
		for (i=1;i<=m;i++)
		{
			fin>>o>>p>>q;
			a[o][p]=q;
			a[p][o]=q;
		}
		for (k=1;k<=n;k++)
		{
			for (i=1;i<=n;i++)
			{
				for (j=1;j<=n;j++)
				{
					if ((a[i][k]!=2)and(a[j][k]!=2))
						if ((i!=k)and(j!=k)and(i!=j))
						{
							o=a[i][k] xor a[j][k];
							if ((a[i][j]==2)or(a[i][j]==o))
							{
								a[i][j]=o;
							}
							else
							{
								fout<<"No Answer"<<endl;
								b=true;
								break;
							}
						}
				}
				if (b) break;
			}
			if (b) break;
		}
		if (not b)
			fout<<a[1][n]<<endl;
	}
	
	fin.close();
	fout.close();
	
	return 0;
}