# [EC Final 2021] Two Walls

## 题意翻译

平面直角坐标系上有两点 $A$ 与 $B$，以及两面墙 $CD,EF$，墙可以视作线段。
请问从 $A$ 到 $B$ 在不碰到墙（端点也不可碰到）的情况下最少要转几次弯（转弯的度数可以任意决定）？

## 题目描述

Prof. Pang has bought a humanoid cleaning robot to clean his yard. The robot is not very sophisticated. It can either move forward or change its direction at a time, all controlled by Prof. Pang's controller.
Prof. Pang's yard is a 2D plane. The robot needs to move from its current location $A$ to the destination $B$ to fulfill some ``cleaning`` needs of Prof. Pang. However, there are two straight walls $CD$ and $EF$ in Prof. Pang's yard. Since the robot is clumsy, it will fall over if it touches any of the walls (even at endpoints).
Now that Prof. Pang is lazy, he wants to minimize the number of times the robot changes its direction. Can you help him?

## 输入输出格式

### 输入格式

The first line contains a single integer $T$ ($1 \le T \le 10^5$) denoting the number of test cases.
For each test case, the first line contains two integers $x_A, y_A$, the coordinates of point $A$. The second line contains two integers $x_B, y_B$, the coordinates of point $B$.
The third line contains four integers $x_C, y_C, x_D, y_D$, the coordinates of point $C$ and $D$ which are the endpoints of the first wall. The fourth line contains four integers $x_E, y_E, x_F, y_F$, the coordinates of point $E$ and $F$ which are the endpoints of the second wall.
It is guaranteed that neither the current location $A$ nor the destination $B$ of the robot are on any of the walls. A wall may degenerate to a point. It can be proved that the robot can always move from $A$ to $B$ without touching any of the walls. All values lie within $[-10^9, 10^9]$.

### 输出格式

For each test case, print one number $d$ in one line, denoting the minimum number of turns.

## 输入输出样例

### 输入样例 #1

```
3
0 0
1 1
2 2 3 3
4 4 5 5
0 0
1 1
2 2 3 3
2 2 3 3
0 0
10 10
10 0 0 10
1 1 2 2
```

### 输出样例 #1

```
0
0
1
```

## 说明

The following are illustrations for the first sample and the third sample.
![](https://cdn.luogu.com.cn/upload/image_hosting/nuyvzg7a.png)
![](https://cdn.luogu.com.cn/upload/image_hosting/diy78yex.png)