@echo off
setlocal enabledelayedexpansion
for /f "tokens=1,2 delims=_" %%i in ('dir /b /a-d "*_track??_[chi].srt"') do (
    set a=%%j
    set a=!a:track=!
    if not exist !a! md !a!
    move "%%i_%%j_[chi].srt" "!a!\%%i.srt"
)
pause
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