How to add specific 2 keywords at the middle of each 3 lines

[faridalabib]

I need to add specific 2 keywords at the middle of each 3 lines
For example, if i have
1111111111111111111
2222222222222222222
3333333333333333333
4444444444444444444
5555555555555555555
6666666666666666666
7777777777777777777
8888888888888888888
9999999999999999999
and i want it to be

1111111111111111111
2222222222222222222
33333333 keyword1 33333333333
4444444444444444444
5555555555555555555
66666666 keyword2 6666666666
7777777777777777777
8888888888888888888
99999999 keyword1 99999999999

How could i do that using notebad++

[PeterJones]

@faridalabib ,

You already asked that here. There is no need to ask the same question twice (and, in fact, it is considered rude and just makes you look impatient).

Replies should go in that other Topic, and not here. This Topic is locked.