Assertion: gastropod's foot | /r/CapableOf | release the proboscis contracts
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Source sentences:
text: Instead of gliding over a slime trail using minute waves in its foot, Truncatella uses a very large and muscular proboscis to reach ahead and grasp a surface, at which point the small foot releases its hold and the proboscis contracts to pull the animal forward, after which the entire procedure is usually repeated.