Correct

开先例

/ kāi xiānlì / 
Strokes

Example

As a Verb

create/establish/set a precedent; set an example

1
Nǐ
你
zhèyàng
这样
zuò
做
kěshì
可是
kāi
开
le
了
gè
个
bùhǎo
不好
de
的
xiānlì
先例
  
。

You have set a bad example by doing this.