Can I Restore Edited 'sysctl.conf' file in /etc ?

I had mistakenly edited the sysctl.conf file in the /etc directory. Now all the configuration lines in that file is missing. Is there a way to restore the file with its previous configuration lines/codes?
 
The default /etc/sysctl.conf is just comments. But it can be copied from /usr/src/etc/sysctl.conf if the source has been installed.
 
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