MOD = 998244353

from types import GeneratorType

def bootstrap(f, stack=[]):
    def wrappedfunc(*args, **kwargs):
        if stack:
            return f(*args, **kwargs)
        to = f(*args, **kwargs)
        while True:
            if type(to) is GeneratorType:
                stack.append(to)
                to = next(to)
            else:
                stack.pop()
                if not stack:
                    break
                to = stack[-1].send(to)
        return to
    return wrappedfunc

@bootstrap
def dfs(n, p):
    A = []
    for v in G[n]:
        if v == p:
            continue
        yield dfs(v, n)
        dp2[n] += dp[v][2]*2
        dp2[n] %= MOD
        for i in range(3):
            dp[n][i+1] += dp[v][i]
            dp[n][i+1] %= MOD
        A.append(tuple(dp[v]))
    for t in A:
        for i in range(3):
            dp[n][i+1] -= t[i]
            dp[n][i+1] %= MOD
        for i in range(3):
            dp2[n] += t[i]*dp[n][2-i]%MOD
            dp2[n] %= MOD
        for i in range(3):
            dp[n][i+1] += t[i]
            dp[n][i+1] %= MOD
    dp2[n] *= half
    dp2[n] %= MOD
    dp[n][0] += 1
    dp[n][0] %= MOD
    yield

half = pow(2, -1, MOD)
for _ in range(int(input())):
    N = int(input())
    G = [[] for _ in range(N)]
    for _ in range(N-1):
        u, v = map(int, input().split())
        u, v = u-1, v-1
        G[u].append(v)
        G[v].append(u)
    
    dp = [[0]*4 for _ in range(N)]
    dp2 = [0]*N
    dfs(0, -1)

    print(sum(dp2)%MOD)