they" in the second paragraph refer to?,,,,characteristics|==gods|images|invaders">
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remembering the source while drinking water?",,,,Forgetting the outlet as the source is more important|Comparing the number of gods to the amount of water|Only drinking water of clear production sources|==Appreciating the contribution of national heroes">
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Since then people have been living out Leonardo's dream of flying.",,,,paragraph 2|paragraph 3|paragraph 4|==paragraph 5">
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