Well that was pretty easy. I think the mistake I made before was trying to go in from the front, which is way hard to do from what I've heard. Also I got stuck trying to get around guards to do a side objective when I could have skipped it. Also, I didn't know I could loot bodies the first time so I ran out of ammo fast.
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You beat yourself up with your past. Don't blame yourself, blame the world. Blame God. Blame me.