key mappings

All, I am trying to map my F5 key to perform a left control and right bracket at the same time. If I map the key using: xmodmap -e "keycode 69 = Control_L bracketright" and run the xmodmap -pk it looks fine but the control left or bracketright is executed one at a time and not simultaneously. How do I get these to execute simultaneously? Thanks in advance,
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