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games/md: add -2 -3 -a and trailing newline to usage

--- a/sys/src/games/md/md.c

+++ b/sys/src/games/md/md.c

@@ -198,7 +198,7 @@

 	} ARGEND;

 	if(argc != 1){

-		fprint(2, "usage: %s rom", argv0);

+		fprint(2, "usage: %s [-23a] rom\n", argv0);

 		threadexitsall("usage");

 	}

 	loadrom(*argv);

-- 

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