Assertion: dog whistle | /r/Synonym | galton's whistle
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Source sentences:
text: A dog whistle (also known as silent whistle or Galton's whistle) is a type of whistle that emits sound in the ultrasonic range, which humans cannot hear but some other animals can, including dogs and domestic cats, and is used in their training.
text: A silent dog whistle, also known as the Galton’s whistle named after its inventor Francis Galton, is a training device that uses ultrasonic sounds.