@echo off
setlocal enabledelayedexpansion
set m=0
set n=1
for /f "delims=" %%i in ('type "a.txt"') do (
    if !m! == 3 (
        set /a n+=1
        set m=1
    ) else (
        set /a m+=1
    )
    >>!n!.txt echo,%%i
)
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