China DOS Union

set a=☆☆☆☆☆☆☆☆☆☆
set b=★
set c=
set d=
set e=123456789abcde

:b
for /l %%a in (0,1,9) do (
set /a f=%random%%%14+1
set/p=!a:~%%a,1!<nul&set/p=%b%<nul
color 0!e:~%f%,1!
set/p=%c%<nul
if %%a equ 9 (set/p=%d%<nul&for /l %%a in (9,-1,1) do (set/p=!a:~-%%a!!<nul&set/p=%b%<nul&set/p=%d%<nul))
)
goto b

What does set/p=!a:~%%a,1! mean?

set/p=!a:~%%a,1!<nul
This is the whole thing.

This batch file is just for displaying a piece of text.

I still don't quite understand. Then what does the part I cut out do?

Displays the variable a=☆☆☆☆☆☆☆☆☆☆ one by one

the five-pointed star in the middle