What are the three full tones of the built-in ringtone tritone for IOS devices?

Three tones, also known as "three tones". Contains three intervals of whole tones, plus four degrees and minus five degrees. 1. Increase by four degrees, that is, there are three between four steps. It is a special case to add four degrees and subtract five degrees in the changing interval, both of which are equal intervals (fa-Si equals FA-do or Mi-Si), and other changing intervals are equal intervals of natural intervals.

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