This paragraph has three sentences but none of them state an overall topic. One might conclude that the topic is some place, but it does not say where.

15. Ten thousand people huddle inside a wall which encircles flat-roofed houses built of baked mud. Dust, inches thick, is stirred up by the camels and donkeys as they move through the town. For six months in the year it never rains: 120 degrees in the shade is not uncommon.

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