Fremen had always known to plant predator fish in their water cisterns. The haploid sandtrout actively resisted great accumulations of water near the planet’s surface; predators swam in that qanat below him. Their sandworm vector could handle small amounts of water—the amounts held in cellular bondage by human flesh, for example. But confronted by large bodies of water, their chemical factories went wild, exploded in the death-transformation which produced the dangerous melange concentrate, the ultimate awareness drug employed in a diluted fraction for the sietch orgy. That pure concentrate
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