//! https://en.wikipedia.org/wiki/Tritonic_scale
// TODO
// 3 2 7 Vietnamese tritonic
// 3 4 5 Ute tritonic, Peruvian tritonic 2
// 4 3 5 Raga Malasri, Peruvian tritonic 1
// 4 5 3 Raga Bilwadala
// 5 2 5 Raga Sarvasri, Warao tritonic: South America
// 5 5 2 Sansagari: Japan
// 6 1 5 Raga Ongkari