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8.3.1 The Body of copy-region-as-kill

The copy-region-as-kill function works in much the same way as the kill-region function. Both are written so that two or more kills in a row combine their text into a single entry. If you yank back the text from the kill ring, you get it all in one piece. Moreover, kills that kill forward from the current position of the cursor are added to the end of the previously copied text and commands that copy text backwards add it to the beginning of the previously copied text. This way, the words in the text stay in the proper order.

Like kill-region, the copy-region-as-kill function makes use of the last-command variable that keeps track of the previous Emacs command.