@echo off
(for /f "delims=" %%i in ('sort 1.txt') do if not defined %%i echo %%i&set "%%i==")>$
move $ 1.txt
pause
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@echo off
for /f "delims=" %%i in (1.txt) do set *%%i==
(for /f "tokens=1,2 delims=*= " %%i in ('set *') do echo %%i %%j)>1.txt
pause
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@echo off
echo.>$
for /f "delims=" %%i in ('sort 1.txt') do if not defined %%i echo %%i>>$&set "%%i=="
move $ 1.txt
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@echo off&setlocal enabledelayedexpansion
(echo.
for /f "delims=" %%i in ('sort 1.txt') do (
    set aa=%%i&call :loop
    for %%j in ("!aa!") do if not defined %%j echo !aa!&set "%%j=="
))>$
move $ 1.txt&goto :eof
:loop
if "!aa:~-1!"==" " set aa=!aa:~,-1!&goto loop
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