#include <bits/extc++.h>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define C const
#define U unsigned
#define SC static
#define CE constexpr
#define TL template
#define TN typename
#define OP operator
#define pb push_back
#define ft first
#define sd second
#define mi (l + (r - l) / 2)
#define TTT TL<TN T = I>
#define BE(v) v.begin(), v.end()
#define VD void
#define I int
#define LL long long
#define STR string
using PII = pair<I, I>;
TTT using V = vector<T>;

#define FORX(v) for(auto& x : v)
#define FORV(v, i) for (I i = 0, _n = v.size(), x = _n ? v[0] : 0;i < _n;x = v[++i])
#define FOR(i, b, e)  for(auto i = b, _e = (decltype(i))e;i != _e; ++i)
#define FORR(i, b, e) for(auto i = b, _e = (decltype(i))e;i != _e; --i)
#define FUNC(T, f, ...) function<T(__VA_ARGS__)> f = [&](__VA_ARGS__)->T

TTT CE T inf() { return numeric_limits<T>::max() / 2; }
TTT VD setmin(T& a, C T& b) { if (b < a)a = b; }
TTT VD setmax(T& a, C T& b) { if (a < b)a = b; }
TTT VD fastpow(T& a, T b, LL i) { for (;i;i >>= 1, b *= b)if (i & 1)a *= b; }

#define OPD(T,S,op,...) \
T& OP op##= (C S& _){{__VA_ARGS__} return *this;}\
friend T OP op (C T& a, C S& b) {T c = a; return c op##= b;}
#define OPB(T,op,...) friend bool OP op (C T& a, C T& b) {return __VA_ARGS__;}
#define OST(T) friend ostream& OP << (ostream & os, C T & a) { return os << a.x; }
struct Mod//WARNING : Mod MUST BE assigned in [0,m) unless using cc
{
	SC U I m; SC U LL i;
	SC VD set(U I mod) { m = mod, i = (U LL)(-1) / m + 1; }
	SC U I mul(U I a, U I b)
	{
		U LL x = (U LL)a * b, y = ((U __int128)x * i >> 64) * m;
		return x - y + (x < y ? m : 0);
	}
	U I x; CE Mod() :x(0) {}
	TTT CE Mod(T x) : x(x) {}
	TTT CE SC Mod cc(T x) { return (x % m + m) % m; }
	OPD(Mod, Mod, +, if ((x += _.x) >= m)x -= m;);
	OPD(Mod, Mod, -, if ((x += m - _.x) >= m)x -= m;);
	OPD(Mod, Mod, *, x = mul(x, _.x););
	OPD(Mod, Mod, / , fastpow(*this, _, m - 2););//m must be a prime
	OPD(Mod, I, ^, fastpow(*this, *this, _ - 1 + (_ > 0 ? 0 : m - 1)););
	OPB(Mod, == , a.x == b.x);
	OPB(Mod, != , a.x != b.x);
	OST(Mod)
};
U I Mod::m; U LL Mod::i;


VD test()
{
	using UM = gp_hash_table<I, Mod>;
	Mod::set(998244353);
	I n, k; cin >> n >> k;
	V<V<I>> e(n + 1);
	V<UM> f(n + 1);

	FOR(i, 1, n)
	{
		I u, v; cin >> u >> v;
		e[u].pb(v), e[v].pb(u);
	}

	FUNC(VD, dfs, I p, I fa)
	{
		f[p][1] = 1;

		FORX(e[p])
		{
			if (x == fa)continue;
			dfs(x, p);

			UM fp;
			for (auto& p1 : f[p])
			{
				for (auto& p2 : f[x])
				{
					if (p1.ft + p2.ft <= k + 1)fp[p1.ft + p2.ft] += p1.sd * p2.sd;
					if (p2.ft >= k) fp[p1.ft] += p1.sd * p2.sd;
				}
			}

			f[p] = move(fp);
		}
	};

	dfs(1, 0);
	cout << f[1][k] + f[1][k + 1] << '\n';
}

I main()
{
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	if (fopen("test.in", "r"))
	{
		freopen("test.in", "r", stdin);
		freopen("test.out", "w", stdout);
	}
	I t = 1;
	cin >> t;
	while (t--)test();
	return 0;
}