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由 Moritz Ulrich 提交于
The behavior is documented in [1]. The prefix doesn't seem to be documented, but it is hardoced as described in [2]. [1]: http://www.gnu.org/software/emacs/manual/html_node/emacs/Interlocking.html#Interlocking [2]: http://tekman.livejournal.com/79598.html
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