Actually, according to the grammar the square brackets in the "tcp
flags" are not literal, so use .Op to show that /mask is optional.
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@ -1,4 +1,4 @@
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.\" $NetBSD: npf.conf.5,v 1.82 2019/01/08 11:28:01 uwe Exp $
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.\" $NetBSD: npf.conf.5,v 1.83 2019/01/08 11:36:10 uwe Exp $
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.\"
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.\" Copyright (c) 2009-2017 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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@ -223,7 +223,7 @@ The
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keyword can be used to match the packets against specific TCP flags,
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according to the following syntax:
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.Pp
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.D1 Ic proto Cm tcp flags Ar match Ns Li [/ Ns Ar mask Ns Li \&]
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.D1 Ic proto Cm tcp flags Ar match Ns Op Li / Ns Ar mask
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.Pp
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Where
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.Ar match
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