Can someone explain how to make a CollideCallback to work with monster and player?

[xxiitrysohardxx]

Could you type out exactly how I'd have it in the script? I'm sorry, I'm sort of a novice at this.

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Wait, I have tried that and won't work. Is this what it's supposed to look like?
AddEntityCollideCallback("monster_2", "Player", "KnockOut", true, 1);