S1 - Someone found the bones of a man who died a very long time ago. |
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S2 - Native Americans think that the bones are from a man who used to be one of them. |
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S3 - They are angry because they can not do it right away. |
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S4 - The scientist was surprised (that) the bones looked like a modern person. |
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S5 - They do not know how the person ended up at the river. |
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