apang

@echo off & setlocal enabledelayedexpansion
for /f "tokens=1-3 delims=." %%a in (a.txt) do (
    if defined Max%%a.%%b (
        if !Max%%a.%%b! lss %%c set "Max%%a.%%b=%%c"
    ) else set "Max%%a.%%b=%%c"

    if defined Min%%a.%%b (
        if !Min%%a.%%b! gtr %%c set "Min%%a.%%b=%%c"
    ) else set "Min%%a.%%b=%%c"
)

(for /f "tokens=1*delims==" %%a in ('"(set Min&set Max)|sort /+4"') do (
    if defined flag (
        if %%b gtr !b! (
            echo,!a:~3!.!b!.0-!a:~3!.%%b.0
        ) else echo,!a:~3!.%%b.0-!a:~3!.!b!.0
        set "flag="
    ) else set "a=%%a" & set /a b=%%b,flag=1
))>b.txt
pause
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