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@echo off (for /f "eol= delims=" %%a in (a.txt) do ( set var=%%a setlocal enabledelayedexpansion if "!var:~,1!!var:~-1!"=="58" echo;!last! endlocal set last=%%a ))>b.txt
@echo off (for /f "eol= delims=" %%a in (a.txt) do ( set var=%%a setlocal enabledelayedexpansion if "!var:45=!" neq "!var!" echo;!last! endlocal set last=%%a ))>b.txt
@echo off setlocal enabledelayedexpansion set n=0 (for /f "delims=" %%a in (a.txt) do ( if !n! leq 1 ( if !n! equ 1 set /a n-=1 & echo;%%a set var=%%a if "!var:45=!" neq "!var!" set n=2 ) else set /a n-=1 ))>b.txt