Codeforces celebrates 10 years! We are pleased to announce the crowdfunding-campaign. Congratulate us by the link https://codeforces.com/10years.
×

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

E. Tree

time limit per test

1.5 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputYou are given a tree with $$$n$$$ nodes and $$$q$$$ queries.

Every query starts with three integers $$$k$$$, $$$m$$$ and $$$r$$$, followed by $$$k$$$ nodes of the tree $$$a_1, a_2, \ldots, a_k$$$. To answer a query, assume that the tree is rooted at $$$r$$$. We want to divide the $$$k$$$ given nodes into at most $$$m$$$ groups such that the following conditions are met:

- Each node should be in exactly one group and each group should have at least one node.
- In any group, there should be no two distinct nodes such that one node is an ancestor (direct or indirect) of the other.

You need to output the number of ways modulo $$$10^{9}+7$$$ for every query.

Input

The first line contains two integers $$$n$$$ and $$$q$$$ ($$$1 \le n, q \le 10^{5}$$$) — the number of vertices in the tree and the number of queries, respectively.

Each of the next $$$n-1$$$ lines contains two integers $$$u$$$ and $$$v$$$ ($$$1 \le u, v \le n, u \ne v$$$), denoting an edge connecting vertex $$$u$$$ and vertex $$$v$$$. It is guaranteed that the given graph is a tree.

Each of the next $$$q$$$ lines starts with three integers $$$k$$$, $$$m$$$ and $$$r$$$ ($$$1 \le k, r \le n$$$, $$$1 \le m \le min(300,k)$$$) — the number of nodes, the maximum number of groups and the root of the tree for the current query, respectively. They are followed by $$$k$$$ distinct integers $$$a_1, a_2, \ldots, a_k$$$ ($$$1 \le a_i \le n$$$), denoting the nodes of the current query.

It is guaranteed that the sum of $$$k$$$ over all queries does not exceed $$$10^{5}$$$.

Output

Print $$$q$$$ lines, where the $$$i$$$-th line contains the answer to the $$$i$$$-th query.

Examples

Input

7 2 5 4 2 6 5 3 1 2 7 5 4 6 3 3 2 7 4 3 3 1 4 6 2 1

Output

2 0

Input

7 2 4 7 2 5 4 1 5 1 5 6 4 3 3 3 2 7 1 4 2 1 6 3 2

Output

1 1

Input

5 2 3 5 4 5 4 2 1 4 2 2 3 1 2 2 2 4 5 4

Output

2 1

Note

Consider the first example.

In the first query, we have to divide the three given nodes ($$$7$$$, $$$4$$$ and $$$3$$$), into the maximum of three groups assuming that the tree is rooted at $$$2$$$. When the tree is rooted at $$$2$$$, $$$4$$$ is an ancestor of both $$$3$$$ and $$$7$$$. So we can't put all the nodes into one group. There is only $$$1$$$ way to divide the given nodes into two groups, which are $$$[4]$$$ and $$$[3, 7]$$$. Also, there is only one way to divide the given nodes into three groups, which are $$$[7]$$$, $$$[4]$$$ and $$$[3]$$$. So, there are total $$$2$$$ ways to divide the given nodes into a maximum of three groups.

In the second query, when the tree is rooted at $$$4$$$, $$$6$$$ is an ancestor of $$$2$$$ and $$$2$$$ is an ancestor of $$$1$$$. So, we can't put all the given nodes into one group.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Feb/29/2020 09:51:04 (g2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|