- Prepare
- Data Structures
- Trees
- Kitty's Calculations on a Tree

# Kitty's Calculations on a Tree

# Kitty's Calculations on a Tree

Kitty has a tree, , consisting of nodes where each node is uniquely labeled from to . Her friend Alex gave her sets, where each set contains distinct nodes. Kitty needs to calculate the following expression on each set:

where:

- denotes an unordered pair of nodes belonging to the set.
- denotes the number of edges on the unique (shortest) path between nodes and .

Given and sets of distinct nodes, calculate the expression for each set. For each set of nodes, print the value of the expression modulo on a new line.

**Example**

The graph looks like this:

There are three pairs that can be created from the query set: . The distance from to is , from to is , and from to is .

Now do the summation:

**Input Format**

The first line contains two space-separated integers, the respective values of (the number of nodes in tree ) and (the number of nodes in the query set).

Each of the subsequent lines contains two space-separated integers, and , that describe an *undirected* edge between nodes and .

The subsequent lines define each set over two lines in the following format:

- The first line contains an integer, , the size of the set.
- The second line contains space-separated integers, the set's elements.

**Constraints**

- The sum of over all does not exceed .
- All elements in each set are
*distinct*.

**Subtasks**

- for of the maximum score.
- for of the maximum score.
- for of the maximum score.

**Output Format**

Print lines of output where each line contains the expression for the query, modulo .

**Sample Input 0**

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

**Sample Output 0**

```
16
0
106
```

**Explanation 0**

Tree looks like this:

We perform the following calculations for sets:

- Set : Given set , the only pair we can form is , where . We then calculate the following answer and print it on a new line:

Set : Given set , we cannot form any pairs because we don't have at least two elements. Thus, we print on a new line.

Set : Given set , we can form the pairs , , and . We then calculate the following answer and print it on a new line: