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https://www.aljazeera.com/features/2017/9/8/the-decline-of-chinantec-whistled-speech-in-mexico
The decline of Chinantec whistled speech in Mexico | Arts and Culture | Al Jazeera
The whistled speech comprises seven tones and can be understood at distances of up to one kilometre away.
the declinewhistled speechchinantecmexicoarts