WHY

@echo off
setlocal enabledelayedexpansion
for /f %%h in ('copy /z %0 nul') do set crlf=%%h^


for %%h in ("!crlf!") do (
    endlocal
    for /f "delims=" %%b in (1.txt) do (
        if defined s2 (
            setlocal enabledelayedexpansion
            echo;!s2:,=%%~h!
            endlocal
        )
        set "s2=%%b"
    )
    if defined s2 (
        setlocal enabledelayedexpansion
        set /p "=!s2:,=%%~h!" < nul
        endlocal
    )
)
pause
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