@echo off&setlocal enabledelayedexpansion
for %%i in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do (
set /a n+=1,a=!random!%%2
if !a! equ 0 (
set "_!random!!random!!random!=%%i"
) else (
set "_!random!!random!!random!=!n!"
)
)
for /f "tokens=2 delims==" %%i in ('set _') do (
set /a n-=1
if !n! equ 15 pause>nul&goto :eof
set /p=%%i <nul
)