@echo off
REM 一致:	d.txt 		
findstr /ixg:"a.txt" "b.txt" >"d.txt"
REM a不含b:	a-1.txt 	
findstr /ivg:"a.txt" "b.txt" >"a-1.txt"
REM b不含a:	b-1.txt 	
findstr /ivg:"b.txt" "a.txt" >"b-1.txt"
REM 去重:	c.txt
(
	more d.txt
	more a-1.txt
	more b-1.txt
) >"c.txt"
pause&exit
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