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What do the father and sons use to haul up boards to make the platform?
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What does the father use to cover the area above the hammocks to protect from rain and insects?
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Who is the first to test the ladder in Chapter 9 of The Swiss Family Robinson?
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What does the father teach the boys while determining the height of the lowest branches?
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What do Fritz and his father plan to do with the wounded flamingo they find?
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What does the father make to shoot a cord over the high limb?
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What do the father and sons use to make the first platform across the high limbs?
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What material do the father and sons use to create the ladder in Chapter 9 of The Swiss Family Robinson?
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What do the boys do at the top of the tree after the platform is built?
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What does the father do to ensure the family's safety while they sleep in the tree?