How to copy multiple lines and paste multiple times under each line separately?

Question

original below. I want to copy each line and paste multiple n times under their own lines separately.

USD
XYZ
ABC
YUT
LMO
.
.
. upto so on

want them to become like this. Any way how can I achieve following in Vim?

USD
USD
USD
USD
USD
USD
XYZ
XYZ
XYZ
XYZ
XYZ
ABC
ABC
ABC
ABC
ABC
YUT
YUT
YUT
YUT
YUT
LMO
LMO
LMO
LMO
LMO
.
.
. upto so on

Answer 1

One option is to a find/replace on your entire file

%s/.*/&\r&/gc

Breakdown

%s    start a substitute on the entire file
.*    capture the entire line to be replaced
&\r&  replace with the entire captured group. Add \r& as amount of required duplicates