Remove pointless subheading
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@ -140,8 +140,6 @@ value for which @racket[equal?] is defined, any @racket[#:prefab]
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structure, most @racket[#:transparent] structures, or any non-object
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structure for which @racket[prop:struct-map] can be defined.
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@subsection{Topics}
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As mentioned above, topics are simply patterns over messages. They are
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represented as normal data structures @emph{with embedded wildcards}.
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Use @racket[?] or @racket[(wild)] to construct a wildcard. For
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