

CODE: [Copy to clipboard]@echo off&Setlocal EnableDelayedExpansion
set "str=abcdefghijklmnopqrstuvwxyz"
set /a n=!random!%%26
echo !str:~%n%,1!
pause

CODE: [Copy to clipboard]@echo off&Setlocal Enabledelayedexpansion
set "str=abcdefghijklmnopqrstuvwxyz"
for /l %%a in (1 1 20) do (
set /a "var1=!random!%%10+5","n=0"&set "var="
call :lb
)
echo.&pause&goto :eof
:lb
if "%n%"=="%var1%" (echo %var%&goto :eof)
set /a n+=1,var2=%random%%%26
set "var=%var%!str:~%var2%,1!"
goto :lb
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