tell application "System Events"

    set x to 0
    set y to 20
    set message to "NOOB"

    delay 2
    repeat
        delay 0.5
        repeat while x < y
            set x to x + 1
            keystroke message
            keystroke return using control down
            keystroke return using control down
            keystroke message
            keystroke return
            delay 0.05
        end repeat
    end repeat
end tell