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diff --git a/magic/Magdir/database b/magic/Magdir/database
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index 5c38f5c..a17cc42 100644
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--- a/magic/Magdir/database
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+++ b/magic/Magdir/database
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@@ -84,8 +84,8 @@
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 #
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 #
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 # Round Robin Database Tool by Tobias Oetiker <oetiker@ee.ethz.ch>
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-0	string	RRD		RRDTool DB
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->4	string	x		version %s
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+0	string/b	RRD\0		RRDTool DB
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+>4	string/b	x		version %s
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 #----------------------------------------------------------------------
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 # ROOT: file(1) magic for ROOT databases
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 #