+.. el:define-key:: c ?
+ M-x notmuch-subkeymap-help
+
+ Show all available copying commands
+
+.. _emacs-show-duplicates:
+
+Dealing with duplicates
+-----------------------
+
+If there are are multiple files with the same :mailheader:`Message-ID`
+(see :any:`duplicate-files`), then :any:`notmuch-show` displays the
+number of duplicates and identifies the current duplicate. In the
+following example duplicate 3 of 5 is displayed.
+
+.. code-block::
+ :emphasize-lines: 1
+
+ M. Mustermann <max@example.com> (Sat, 30 Jul 2022 10:33:10 -0300) (inbox signed) 3/5
+ Subject: Re: Multiple files per message in emacs
+ To: notmuch@notmuchmail.org
+
+.. el:define-key:: %
+ M-x notmuch-show-choose-duplicate
+
+ |docstring::notmuch-show-choose-duplicate|