vsbat

@echo off
set /a n=0
set /a maxnum=240

:DO
	set /p x=Input:
	if defined #%x% (call :SHOWOK) else (set "#%x%=v")
	set /a n+=1
	if %n% geq %maxnum% (goto :END)
	goto :DO

:SHOWOK
	echo.找到一个重复的: %x%
	exit /b

:END	
	echo.结束
	pause
	EXIT
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