I want to replace the third and fourth line of file\_2 by the first two lines of a file\_1 

\*Input: 

file\_1 

```
what's your name?I am jo 
how are you?I am all right  

```

file\_2:

```
introduction

what's your name?
how are you?

this is jo's file

```

\*Desired Output:

```
introduction 

what's your name?I am jo
how are you?I am all right

This is jo's file

```

tankx guys!