77七

code1

@echo off
(for /f "useback delims=" %%a in ("1.txt") do (
        for %%b in (%%a) do (
                set /p=%%b <nul
        )
)
echo=
)>3.txt
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code2

@echo off
(for /f "useback delims=" %%a in ("2.txt") do (
	call :1 "%%a"
))>4.txt
pause & exit

	:1
	set str=%~1
	:loop
	for /f "tokens=1-2*" %%b in ("%str%") do (
		echo %%b %%c
		if "%%d" neq "" (
			set str=%%d
			goto :loop
		) else exit /b
	)
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