import sys
input = sys.stdin.readline

from collections import deque

T=int(input())

for tests in range(T):
    N,M=list(map(int,input().split()))
    S=[list(map(int,input().split())) for i in range(M)]

    E=[[] for i in range(N+1)]


    for a,b,c in S:

        if c==1:
            E[a].append(b)
            E[b].append(a)

    D1=[1<<30]*(N+1)
    D2=[1<<30]*(N+1)

    Q=deque([1])
    D1[1]=0

    while Q:
        x=Q.popleft()
        for to in E[x]:
             if D1[to]>D1[x]+1:
                 D1[to]=D1[x]+1
                 Q.append(to)
    

    if D1[N]<N*2:
        ANS=D1[N]
        print("Same")
        print(ANS)
        continue

    Q=deque([N])
    D2[N]=0

    while Q:
        x=Q.popleft()
        for to in E[x]:
             if D2[to]>D2[x]+1:
                 D2[to]=D2[x]+1
                 Q.append(to)

    ANS=1<<30

    for a,b,c in S:
        if c==2:
            if D1[a]<N*2 and D2[b]<N*2:
                ANS=min(ANS,D1[a]+D2[b]+1)
            if D1[b]<N*2 and D2[a]<N*2:
                ANS=min(ANS,D1[b]+D2[a]+1)

    if ANS<2*N:
        print("Differenct")
        print(ANS)
    else:
        print("Unknown")