Can I script the enter key?

how do I make this script hit the “return” key between theContent and theSubject on the clipboard?

tell application "Mail"
			repeat with eachMessage in theMessages
				set theContent to content of eachMessage
				set theSubject to subject of eachMessage
			end repeat
			set the clipboard to theSubject & theContent
		end tell

So, you basically want theSubject and theContent to be seperated by a carriage return, right? You should be able to just do this

set the clipboard to theSubject & return & theContent 


Thank you.