def main():
    n, m = list(map(int, input().split()))
    node = [[] for _ in range(n)]
    for _ in range(m):
        u, v, x = list(map(lambda x: int(x)-1, input().split()))
        node[u].append((v, x))
    D = [-1] * n
    E = [-1] * n
    D[0] = 0
    B = [0]
    while A:= B:
        B = []
        for now in A:
            for nxt, x in node[now]:
                if D[nxt] == -1:
                    if x == 0:
                        D[nxt] = D[now]+1
                        B.append(nxt)
                    elif nxt == n-1:
                        print("Different")
                        return D[now] + 1
    if D[n-1] == -1:
        print("Unknown")
        return 0
    else:
        print("Same")
        return D[n-1]

for _ in range(int(input())):
    ans = main()
    if ans: print(ans)