zhouyongjun

@echo off&setlocal enabledelayedexpansion
set "str=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"
for %%i in (%str%) do set/a n+=1&set "_!n!=!n! %%i"
:loop
set/a m=%random%%%26+1,n=%random%%%2+1
if not defined #%m% (
    for /f "tokens=1,2" %%1 in ("!_%m%!") do (
        <nul set/p=%%%n% &set/a num+=1,#%m%=0
     )
)
if %num% lss 10 goto loop
echo/&pause
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