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### 繪製流程圖 Flowchart

```flow
st=>start: 使用者登陸
op=>operation: 登陸操作
cond=>condition: 登陸成功 Yes or No?
e=>end: 進入後臺

st->op->cond
cond(yes)->e
cond(no)->op
```
[========]

### 繪製序列圖 Sequence Diagram

```seq
Andrew->China: Says Hello
Note right of China: China thinks\nabout it
China-->Andrew: How are you?
Andrew->>China: I am good thanks!
```