@echo off
setlocal enabledelayedexpansion
set fn=a.txt
for /f "tokens=2 delims=:" %%i in ('find /c /v ".*" %fn%') do set /a n=%%i-10
(for /f "tokens=*" %%i in (%fn%) do (
set /a m+=1
if !m! lss %n% echo %%i))>temp.txt
move /y temp.txt %fn%
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