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Vault Chamber 4

GLaDOS: Congratulations, you guessed correctly. I suppose humans aren't as stupid as I thought, are they? Not that you'd know, since you aren't even human.

Sorry, didn't mean to let that one slip out. Of course you're human. One hundred percent.

Anyway, you're getting close. Remember, complete this assignment, and I'll let you go free. You can be with your family again. What? You don't remember them? That's a shame. They were nice people.

Good luck. And don't fail me.