@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!=!n!"
      ) else (
      set "_!random!!random!!random!=%%i"
   )
)
for /f "tokens=2 delims==" %%i in ('set _') do (
    set /a n-=1
    if !n! equ 15 pause>nul&goto :eof
    pause  
    set /p=%%i <nul
)
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