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findstr /v /g:a.txt b.txt >a副本.txt
for /f "delims=" %%i in (a.txt) do set "%%i==" for /f "delims=" %%i in (b.txt) do if not defined %%i >>c.txt echo.%%i
for /f "delims=" %%i in (a.txt) do set "%%i==" for /f "delims=" %%i in (b.txt) do if defined %%i >>c.txt echo.%%i