dongdong

@echo off
setlocal enabledelayedexpansion
set dst=■■■■
set /a x=%random%%%4
set /a num=4-%X%
if not %x%==0 (goto :_get) else (goto :_next)
: _get
if not %num%==0  (
for %%c in (%dst%) do (
set mm=%%c
echo !mm:~0,%x%!  
echo. &&echo !mm:~0,%num%! 2>nul
pause>nul )  
) else (echo !mm:~0,%x%!)
goto :end
: _next
echo !mm:~0,%num%!
:end