You are given an unweighted tree with N$N$ nodes (numbered 1$1$ through N$N$). Let's denote the distance between any two nodes p$p$ and q$q$ by d(p,q)$d(p, q)$.
You should answer Q$Q$ queries. In each query, you are given parameters a$a$, da$d_a$, b$b$, db$d_b$, and you should find a node x$x$ such that d(x,a)=da$d(x, a) = d_a$ and d(x,b)=db$d(x, b) = d_b$, or determine that there is no such node.

-----Input-----
- The first line of the input contains a single integer T$T$ denoting the number of test cases. The description of T$T$ test cases follows.
- The first line of each test case contains two space-separated integers N$N$ and Q$Q$.
- Each of the next N−1$N-1$ lines contains two space-separated integers u$u$ and v$v$ denoting that nodes u$u$ and v$v$ are connected by an edge.
- Each of the next Q$Q$ lines contains four space-separated integers a$a$, da$d_a$, b$b$ and db$d_b$ describing a query.

-----Output-----
For each query, print a single line containing one integer ― the number of a node satisfying the given requirements, or −1$-1$ if no such node exists.
If there are multiple solutions, you may output any one.

-----Constraints-----
- 1≤T≤1,000$1 \le T \le 1,000$
- 1≤N,Q≤106$1 \le N, Q \le 10^6$
- 1≤u,v≤N$1 \le u, v \le N$
- the graph on the input is a tree
- 1≤a,b≤N$1 \le a, b \le N$
- 1≤da,db<N$1 \le d_a, d_b < N$
- the sum of N$N$ over all test cases does not exceed 106$10^6$
- the sum of Q$Q$ over all test cases does not exceed 106$10^6$

-----Subtasks-----
Subtask #1 (50 points):
- 1≤N,Q≤1,000$1 \le N, Q \le 1,000$
- the sum of N$N$ over all test cases does not exceed 1,000$1,000$
- the sum of Q$Q$ over all test cases does not exceed 1,000$1,000$
Subtask #2 (50 points): original constraints

-----Example Input-----
1
5 3
1 2
2 3
3 4
3 5
2 1 4 1
2 2 4 2
1 1 2 1

-----Example Output-----
3
5
-1

Difficulty: interview

Starter code:

Solutions:
# cook your dish here
class TestCase:
    def __init__(self):
        [self.node_count, self.query_count] = read_line()
        
    def fill_nodes(self):
        self.nodes = {n+1: [] for n in range(self.node_count)}
        for i in range(self.node_count -1):
            new_node_1, new_node_2 = read_line()
            self.nodes[new_node_1].append(new_node_2)
            self.nodes[new_node_2].append(new_node_1)
            
    def resolve_query(self, query):
        a, d_a, b, d_b = query
        suiting_a = self.find_nodes_with_distance(a, d_a)
        suiting_b = self.find_nodes_with_distance(b, d_b)
        fitting = [node for node in suiting_a if node in suiting_b]
        
        if len(fitting) == 0:
            return -1
        else:
            return fitting[0]
        
    def find_nodes_with_distance(self, start_node, distance):
        from_nodes = {start_node}
        passed_nodes = from_nodes
        
        for i in range(distance):
            to_nodes = set()
            # add all adjacent nodes
            for node in from_nodes:
                to_nodes.update(self.nodes[node])
            
            # no backtracking
            for node in passed_nodes:
                if node in to_nodes:
                    to_nodes.remove(node)
            
            # update which nodes are passed
            passed_nodes.update(to_nodes)
            # go another round with the new nodes found
            from_nodes = to_nodes
        return list(from_nodes)

def read_line():
    line = input()
    return [int(s) for s in line.split(' ')]

num_testcases = int(input())
for i in range(num_testcases):
    testcase = TestCase()
    testcase.fill_nodes()
    for q in range(testcase.query_count):
        query = read_line()
        print(testcase.resolve_query(query))

class TestCase:
    def __init__(self):
        [self.node_count, self.query_count] = read_line()
        
    def fill_nodes(self):
        self.nodes = {n+1: [] for n in range(self.node_count)}
        for i in range(self.node_count -1):
            new_node_1, new_node_2 = read_line()
            self.nodes[new_node_1].append(new_node_2)
            self.nodes[new_node_2].append(new_node_1)
            
    def resolve_query(self, query):
        a, d_a, b, d_b = query
        suiting_a = self.find_nodes_with_distance(a, d_a)
        suiting_b = self.find_nodes_with_distance(b, d_b)
        fitting = [node for node in suiting_a if node in suiting_b]
        
        if len(fitting) == 0:
            return -1
        else:
            return fitting[0]
        
    def find_nodes_with_distance(self, start_node, distance):
        from_nodes = {start_node}
        passed_nodes = from_nodes
        
        for i in range(distance):
            to_nodes = set()
            # add all adjacent nodes
            for node in from_nodes:
                to_nodes.update(self.nodes[node])
            
            # no backtracking
            for node in passed_nodes:
                if node in to_nodes:
                    to_nodes.remove(node)
            
            # update which nodes are passed
            passed_nodes.update(to_nodes)
            # go another round with the new nodes found
            from_nodes = to_nodes
        return list(from_nodes)

def read_line():
    line = input()
    return [int(s) for s in line.split(' ')]

num_testcases = int(input())
for i in range(num_testcases):
    testcase = TestCase()
    testcase.fill_nodes()
    for q in range(testcase.query_count):
        query = read_line()
        print(testcase.resolve_query(query))

def bfs(tr,sp,d):
    temp=[sp]
    vl=[-1]*len(tr)
    vl[sp]=0
    while(len(temp)>0):
        z=temp.pop(0)
        if(vl[z]>=d):
            continue
        for e in tr[z]:
            if(vl[e]==-1):
                vl[e]=vl[z]+1
                temp.append(e)
    return [i for i in range(len(vl)) if vl[i]==d]

def myfunc():
    n,q=list(map(int,input().split()))
    tr=[[] for _ in range(n+1)]
    for _ in range(n-1):
        u,v=list(map(int,input().split()))
        tr[u].append(v)
        tr[v].append(u)
    for qn in range(q):
        a,da,b,db=list(map(int,input().split()))
        ta=set(bfs(tr,a,da))
        tb=set(bfs(tr,b,db))
        x=list(ta.intersection(tb))
        if(len(x)>0):
            print(x[0])
        else:print(-1)


t=int(input())
for _ in range(t):
    myfunc()

# cook your dish here
def bfs(tr,sp,d):
    temp=[sp]
    vl=[-1]*len(tr)
    vl[sp]=0
    while(len(temp)>0):
        z=temp.pop(0)
        if(vl[z]>=d):
            continue
        for e in tr[z]:
            if(vl[e]==-1):
                vl[e]=vl[z]+1
                temp.append(e)
    return [i for i in range(len(vl)) if vl[i]==d]

def myfunc():
    n,q=list(map(int,input().split()))
    tr=[[] for _ in range(n+1)]
    for _ in range(n-1):
        u,v=list(map(int,input().split()))
        tr[u].append(v)
        tr[v].append(u)
    for qn in range(q):
        a,da,b,db=list(map(int,input().split()))
        ta=set(bfs(tr,a,da))
        tb=set(bfs(tr,b,db))
        x=list(ta.intersection(tb))
        if(len(x)>0):
            print(x[0])
        else:print(-1)


t=int(input())
for _ in range(t):
    myfunc()

# cook your dish here
def bfs(tr,sp,d):
    temp=[sp]
    vl=[-1]*len(tr)
    vl[sp]=0
    while(len(temp)>0):
        z=temp.pop(0)
        if(vl[z]>=d):
            continue
        for e in tr[z]:
            if(vl[e]==-1):
                vl[e]=vl[z]+1
                temp.append(e)
    return [i for i in range(len(vl)) if vl[i]==d]

def myfunc():
    n,q=list(map(int,input().split()))
    tr=[[] for _ in range(n+1)]
    for _ in range(n-1):
        u,v=list(map(int,input().split()))
        tr[u].append(v)
        tr[v].append(u)
    for qn in range(q):
        a,da,b,db=list(map(int,input().split()))
        ta=set(bfs(tr,a,da))
        tb=set(bfs(tr,b,db))
        x=list(ta.intersection(tb))
        if(len(x)>0):
            print(x[0])
        else:print(-1)


t=int(input())
for _ in range(t):
    myfunc()

def bfs(tr,sp,d):
    temp=[sp]
    vl=[-1]*len(tr)
    vl[sp]=0
    while(len(temp)>0):
        z=temp.pop(0)
        if(vl[z]>=d):
            continue
        for e in tr[z]:
            if(vl[e]==-1):
                vl[e]=vl[z]+1
                temp.append(e)
    return [i for i in range(len(vl)) if vl[i]==d]

def myfunc():
    n,q=list(map(int,input().split()))
    tr=[[] for _ in range(n+1)]
    for _ in range(n-1):
        u,v=list(map(int,input().split()))
        tr[u].append(v)
        tr[v].append(u)
    for qn in range(q):
        a,da,b,db=list(map(int,input().split()))
        ta=set(bfs(tr,a,da))
        tb=set(bfs(tr,b,db))
        x=list(ta.intersection(tb))
        if(len(x)>0):
            print(x[0])
        else:print(-1)


t=int(input())
for _ in range(t):
    myfunc()

t = int(input().strip())
result = []

class Distance:
    def __init__(self , n , dist):
        self.n = n
        self.dist = dist

    def cal_dist(self,u,v):
        self.dist[u][v] = self.dist[v][u] = 1
        for i in range(n):
            if self.dist[u][i] != -1 and self.dist[v][i] == -1 and i!=u and i!=v:
                self.dist[v][i] = self.dist[i][v] = self.dist[u][i] + 1
        for i in range(n):
            if self.dist[v][i] != -1 and self.dist[u][i] == -1 and i!=u and i!=v:
                self.dist[u][i] = self.dist[i][u] = self.dist[v][i] + 1
                
    def return_dist(self):
        return self.dist

for i in range(t):
    n,q = map(int, input().strip().split())
    dist = [[-1 for j in range(n)] for k in range(n)]
    for j in range(n):
        dist[j][j] = 0
    d = Distance(n,dist)
    for j in range(n-1):
        u , v = map(int , input().strip().split())
        d.cal_dist(u-1,v-1)
    dist = d.return_dist()
    for j in range(q):
        a , da , b , db = map(int , input().strip().split())
        ans = -1
        for k in range(n):
            if dist[a-1][k] == da and dist[b-1][k] == db:
                ans = k+1
                break
        result.append(ans)
        
print(*result,sep="\n")

# cook your dish here
t = int(input().strip())
result = []

class Distance:
    def __init__(self , n , dist):
        self.n = n
        self.dist = dist

    def cal_dist(self,u,v):
        self.dist[u][v] = self.dist[v][u] = 1
        for i in range(n):
            if self.dist[u][i] != -1 and self.dist[v][i] == -1 and i!=u and i!=v:
                self.dist[v][i] = self.dist[i][v] = self.dist[u][i] + 1
        for i in range(n):
            if self.dist[v][i] != -1 and self.dist[u][i] == -1 and i!=u and i!=v:
                self.dist[u][i] = self.dist[i][u] = self.dist[v][i] + 1
                
    def return_dist(self):
        return self.dist

for i in range(t):
    n,q = map(int, input().strip().split())
    dist = [[-1 for j in range(n)] for k in range(n)]
    for j in range(n):
        dist[j][j] = 0
    d = Distance(n,dist)
    for j in range(n-1):
        u , v = map(int , input().strip().split())
        d.cal_dist(u-1,v-1)
    dist = d.return_dist()
    for j in range(q):
        a , da , b , db = map(int , input().strip().split())
        ans = -1
        for k in range(n):
            if dist[a-1][k] == da and dist[b-1][k] == db:
                ans = k+1
                break
        result.append(ans)
        
print(*result,sep="\n")

# cook your dish here
# cook your dish here
t = int(input().strip())
result = []

class Distance:
    def __init__(self , n , dist):
        self.n = n
        self.dist = dist

    def cal_dist(self,u,v):
        self.dist[u][v] = self.dist[v][u] = 1
        for i in range(n):
            if self.dist[u][i] != -1 and self.dist[v][i] == -1 and i!=u and i!=v:
                self.dist[v][i] = self.dist[i][v] = self.dist[u][i] + 1
        for i in range(n):
            if self.dist[v][i] != -1 and self.dist[u][i] == -1 and i!=u and i!=v:
                self.dist[u][i] = self.dist[i][u] = self.dist[v][i] + 1
                
    def return_dist(self):
        return self.dist

for i in range(t):
    n,q = map(int, input().strip().split())
    dist = [[-1 for j in range(n)] for k in range(n)]
    for j in range(n):
        dist[j][j] = 0
    d = Distance(n,dist)
    for j in range(n-1):
        u , v = map(int , input().strip().split())
        d.cal_dist(u-1,v-1)
    dist = d.return_dist()
    for j in range(q):
        a , da , b , db = map(int , input().strip().split())
        ans = -1
        for k in range(n):
            if dist[a-1][k] == da and dist[b-1][k] == db:
                ans = k+1
                break
        result.append(ans)
        
print(*result,sep="\n")

# cook your dish here
t = int(input().strip())
result = []

class Distance:
    def __init__(self , n , dist):
        self.n = n
        self.dist = dist

    def cal_dist(self,u,v):
        self.dist[u][v] = self.dist[v][u] = 1
        for i in range(n):
            if self.dist[u][i] != -1 and self.dist[v][i] == -1 and i!=u and i!=v:
                self.dist[v][i] = self.dist[i][v] = self.dist[u][i] + 1
        for i in range(n):
            if self.dist[v][i] != -1 and self.dist[u][i] == -1 and i!=u and i!=v:
                self.dist[u][i] = self.dist[i][u] = self.dist[v][i] + 1
                
    def return_dist(self):
        return self.dist

for i in range(t):
    n,q = map(int, input().strip().split())
    dist = [[-1 for j in range(n)] for k in range(n)]
    for j in range(n):
        dist[j][j] = 0
    d = Distance(n,dist)
    for j in range(n-1):
        u , v = map(int , input().strip().split())
        d.cal_dist(u-1,v-1)
    dist = d.return_dist()
    for j in range(q):
        a , da , b , db = map(int , input().strip().split())
        ans = -1
        for k in range(n):
            if dist[a-1][k] == da and dist[b-1][k] == db:
                ans = k+1
                break
        result.append(ans)
        
print(*result,sep="\n")

# cook your dish here
t = int(input().strip())
result = []

class Distance:
    def __init__(self , n , dist):
        self.n = n
        self.dist = dist

    def cal_dist(self,u,v):
        self.dist[u][v] = self.dist[v][u] = 1
        for i in range(n):
            if self.dist[u][i] != -1 and self.dist[v][i] == -1 and i!=u and i!=v:
                self.dist[v][i] = self.dist[i][v] = self.dist[u][i] + 1
        for i in range(n):
            if self.dist[v][i] != -1 and self.dist[u][i] == -1 and i!=u and i!=v:
                self.dist[u][i] = self.dist[i][u] = self.dist[v][i] + 1
                
    def return_dist(self):
        return self.dist

for i in range(t):
    n,q = map(int, input().strip().split())
    dist = [[-1 for j in range(n)] for k in range(n)]
    for j in range(n):
        dist[j][j] = 0
    d = Distance(n,dist)
    for j in range(n-1):
        u , v = map(int , input().strip().split())
        d.cal_dist(u-1,v-1)
    dist = d.return_dist()
    for j in range(q):
        a , da , b , db = map(int , input().strip().split())
        ans = -1
        for k in range(n):
            if dist[a-1][k] == da and dist[b-1][k] == db:
                ans = k+1
                break
        result.append(ans)
        
print(*result,sep="\n")

try:
    t=int(input())
    for __ in range(t):
        N,m=map(int,input().split())
        A=[]
        dic={}
        for i in range(N-1):
            a,b=map(int,input().split())
            if a in dic:
                dic[a]+=str(b)+","
            else:
                dic[a]=str(b)+","
            if b in dic:
                dic[b]+=str(a)+","
            else:
                dic[b]=str(a)+","
        for _ in range(m):
            term1,dist1,term2,dist2=map(str,input().split())
            l=[term1]
            A=[]
            def distance(t,c,x,A,l):
                if t==int(c):
                    A+=[x]
                else:
                    string=""
                    for i in dic[int(x)]:
                        if i==",":
                            if string not in l:
                                l+=[string]
                                x=string
                                distance(t+1,c,x,A,l)
                                string=""
                            else:
                                string=""
                        else:
                            string+=str(i)
            distance(0,dist1,term1,A,l)
            l1=[]
            for i in A:
                if i!=term1:
                    l1+=[i]
            A=[]
            l=[term2]
            distance(0,dist2,term2,A,l)
            l2=[]
            for i in A:
                if i!=term2:
                    l2+=[i]
            count=0
            for i in l1:
                if i in l2:
                    if count<1:
                        print(int(i))
                        count+=1
            if count==0:
                print(-1)
except:
    pass

        
        


# cook your dish here
def dist(a,b):
    if (a,b) in di :
        return di[(a,b)]
    if distance[a]<distance[b]:
        a,b = b,a
    c = distance[a] - distance[b]
    l = []
    t = a
    while c:
        l.append(t)
        t = p[t]
        c -= 1
    w = b
    r = []
    while t!=w:
        l.append(t)
        r.append(w)
        t = p[t]
        w = p[w]
    for i in l:
        for j in r :
            di[(i,j)] = distance[i] + distance[j] - 2*distance[t]
    di[(a,b)] = distance[a] + distance[b] - 2*distance[t]
    return di[(a,b)]
    
t = int(input())
for t_iter in range(t):
    n,q = map(int,input().split())
    g = {}
    for i in range(n):
        g[i] = []
    for i in range(n-1):
        u,v = map(int,input().split())
        g[u-1].append(v-1)
        g[v-1].append(u-1)
    
    p = [None]*n
    distance = [-1]*n
    distance[0] = 0
    qu= [0]
    while len(qu):
        u = qu.pop(0)
        for v in g[u]:
            if distance[v] == -1:
                distance[v] = distance[u] + 1 
                p[v] = u
                qu.append(v)
    # print(p)
    # print(distance)
    di = {}
    for q_iter in range(q):
        a,da,b,db = map(int,input().split())
        a -= 1
        b -= 1
        flag = 0
        for i in range(n):
            if dist(a,i) == da and dist(b,i) == db :
                print(i+1)
                flag = 1
                break
        if flag == 0:
            print(-1)
                
    
        
        


# cook your dish here
def dist(a,b):
    if (a,b) in di :
        return di[(a,b)]
    if distance[a]<distance[b]:
        a,b = b,a
    c = distance[a] - distance[b]
    t = a
    while c:
        t = p[t]
        c -= 1
    w = b
    while t!=w:
        t = p[t]
        w = p[w]
    di[(a,b)] = distance[a] + distance[b] - 2*distance[t]
    return di[(a,b)]
    
t = int(input())
for t_iter in range(t):
    n,q = map(int,input().split())
    g = {}
    for i in range(n):
        g[i] = []
    for i in range(n-1):
        u,v = map(int,input().split())
        g[u-1].append(v-1)
        g[v-1].append(u-1)
    
    p = [None]*n
    distance = [-1]*n
    distance[0] = 0
    qu= [0]
    while len(qu):
        u = qu.pop(0)
        for v in g[u]:
            if distance[v] == -1:
                distance[v] = distance[u] + 1 
                p[v] = u
                qu.append(v)
    # print(p)
    # print(distance)
    di = {}
    for q_iter in range(q):
        a,da,b,db = map(int,input().split())
        a -= 1
        b -= 1
        flag = 0
        for i in range(n):
            if dist(a,i) == da and dist(b,i) == db :
                print(i+1)
                flag = 1
                break
        if flag == 0:
            print(-1)
                
    
        
        


# cook your dish here
def dist(a,b):
    if distance[a]<distance[b]:
        a,b = b,a
    c = distance[a] - distance[b]
    t = a
    while c:
        t = p[t]
        c -= 1
    w = b
    while t!=w:
        t = p[t]
        w = p[w]
    return distance[a] + distance[b] - 2*distance[t]
    
t = int(input())
for t_iter in range(t):
    n,q = map(int,input().split())
    g = {}
    for i in range(n):
        g[i] = []
    for i in range(n-1):
        u,v = map(int,input().split())
        g[u-1].append(v-1)
        g[v-1].append(u-1)
    
    p = [None]*n
    distance = [-1]*n
    distance[0] = 0
    qu= [0]
    while len(qu):
        u = qu.pop(0)
        for v in g[u]:
            if distance[v] == -1:
                distance[v] = distance[u] + 1 
                p[v] = u
                qu.append(v)
    # print(p)
    # print(distance)
    for q_iter in range(q):
        a,da,b,db = map(int,input().split())
        a -= 1
        b -= 1
        flag = 0
        for i in range(n):
            if dist(a,i) == da and dist(b,i) == db :
                print(i+1)
                flag = 1
                break
        if flag == 0:
            print(-1)
                
    
        
        

import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj
t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1




import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1


import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1


# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1

# cook your dish here
import numpy as np

def add(adj,a,b,n):
    adj[a,b] = adj[b,a] = 1
    for i in range(n):
        if adj[a,i]!=-10 and a!=i and b!=i and adj[b,i]==-10:
            adj[b,i] = adj[a,i] + 1
            adj[i,b] = adj[b,i]
    for i in range(n):
        if adj[b,i]!=-10 and b!=i and a!=i and adj[a,i]==-10:
            adj[a,i] = adj[b,i] + 1
            adj[i,a] = adj[a,i]
    return adj

t = int(input())
while t>0 :
    n,q = map(int,input().split())
    adj = np.zeros((n,n),dtype = 'int')
    adj += np.array([-10])
    for i in range(n):
        adj[i,i] = 0
    for i in range(1,n):
        a,b = map(int,input().split())
        adj = add(adj,a-1,b-1,n)
    for _ in range(q):
        a,da,b,db = map(int,input().split())
        x = -1
        for i in range(n):
            if adj[a-1,i] == da and adj[b-1,i] == db:
                x = i + 1
                break
        print(x)
    t -= 1