This puzzle is not very difficult but it is knowledge based.
In front of you there are 4 switches. From these switches there are 4 right combinations to open the gate to the control room. You can either turn on a switch(green) or turn it off(red).
However if you try any of the wrong switch combinations, the room security has hidden weapons set to kill you.
You found the document with the title "the key to controlling room".
"the document is the hidden note so only the person who created the gate key can understand the logic and can open the gate but somehow you get it after hacking into his system."
The document has only these letters inside it.
it doesn't matter whatever combination you try, I am the truth of OR