Based on the clues provided in the paragraphs, we can conclude the following:
- The country is located below sea level. This can be inferred from the fact that strong walls are built to hold back the sea, suggesting that the country is in a vulnerable position relative to sea level.
The other statements cannot be accurately inferred from the information given:
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The men in the country know how to swim. There's no indication in the passage about the swimming abilities of the men.
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The walls in the country are made from bricks. The material of the walls is not specified; they are described as being thick, but there is no information on whether they are made of bricks or another material.
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The country is located high on a mountain top. This contradicts the need for walls to hold back the sea, suggesting that the country is in a lower elevation, not high up.
Therefore, the only clear conclusion is that the country is located below sea level.