@echo off
set "src=E:\2"
set "dst=E:\1"
powershell -c "$fd='%dst%\'+(Get-Date).ToString('yyyyMMdd');md $fd -force|out-null;cd '%src%';dir *.pdf|group {$_.basename.split('_')[0]}|%%{$_.group|sort {$_.LastWriteTime} -desc|select -first 1|%%{cp $_ $fd}}"
pause
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