setlocal enabledelayedexpansion
set n=0
  for /f %%a in (A.txt) do (
    set /a n=!n!+1
    set m=0
    set write=1
    for /f %%b in (A.txt) do (
      set /a m=!m!+1
      if !m! lss !n! (
        if %%a == %%b ( set write=0 )
    )
  )
  if !write! equ 1 echo %%a >> result.txt
)
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powershell "(gc 'a.txt' | sort -Unique) | Out-File a.txt"
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gawk "!a[$0]++" "a.txt" > "b.txt"
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(for /f "tokens=1,2 delims= " %%c in (A.txt) do (
    findstr /c:"%%c" B.txt>nul||echo %%c
))>B.txt
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@echo off&SetLocal EnableDelayedExpansion
(for /f "delims=" %%a in (a.txt) do (
    if "!%%a!"=="" (
        echo %%a
        set %%a=0
    )
))>b.txt
pause
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