1) :w
2) :10w test2.txt
3) :1,$ s/AI/Artificial Learning/gc
4) 5G
   "add
   :w
   :e test2.txt
   "ap
5) 1G
   15l
   3j
   2h
   rM
   :w
6) :e test2.txt
   3e
   2b
   X
   $
   :w 
7) :e test1.txt
   1G
   2J
8) 7G
   dd
   :wq!


part b

1G
2w
i< [ESC]
A> [ESC]
2j
3svoid [ESC]
j2e
r"
4w
2x
a\n [ESC]
l
r"
A; [ESC]
j$
i(1) [ESC]
o} [ESC]
:x