Rescuing Ralph

Nested hint: How does this segment start?
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Nested hint: How do I get through the fence?
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Nested hint: How do I get into the complex?
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Nested hint: How can I see in the air ducts?
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Nested hint: How can I find Ralph?
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Nested hint: I've found Ralph, but I can't get to him.
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Nested hint: How do I get out of the interrogation room?
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Nested hint: Where can I find the other dog?
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Nested hint: How do I get out of here?
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