Taittiriya Pratishakhya 23.19
Taittiriya Pratishakhya · 23 · Verse 19
vedangashikshapratishakhyataittiriya-pratishakhyachapter-23
Sanskrit Original
तच्चतुर्यममित्युक्तम।।
taccaturyamamityuktam||
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That is what is called the quaternion of tones.