Brazier forebore the obvious retort and walked out onto the alkali flat. He stopped in its center and turned slowly, his eyes searching. They found nothing. He went to the edge of the flat and began circling it slowly. In four places there were marks in the dust. The marks formed the four corners of a huge square. Something might have set down there but you couldn't be sure. Probably dust-marks left by the swirling wind-devils that danced across the desert like miniature cyclones.

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