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@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in ('dir /b /a-d "*.ts"') do (
   set str=%%i
   set/a n=0,m+=1
   set "_!m!=%%i"
   call:lp
   if !n! gtr !t! set/a t=n
)
for /l %%i in (1,1,%m%) do (
    set str=!_%%i!
    for /l %%j in (1,1,%t%) do set "str=/!str!"
    set /!str:~-%t%!=!_%%i!
)
for /f "tokens=2 delims==" %%i in ('set /') do echo %%i
pause&exit
:lp
if defined str (
   set/a n+=1
   set str=%str:~1%
   goto lp
)
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