悬崖之树

@echo off & setlocal enabledelayedexpansion
for /f %%i in (a.txt) do (
   set /a n+=1
   set _!n!=%%i
)
echo 共有%n%行

for /l %%i in (1 1 5) do (
   set /a m=!random!%%%n%+1
   call echo %%_!m!%%
)
pause
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