| http://www.w3.org/ns/prov#value | - For best results raise the volume!How it works (by Wikipedia):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 people cannot hear but other animals can, including dogs and cats, and is used in their training.To human ears, a dog whistle makes only a quiet hissing sound.
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