द्विकस्त्रिकश्चतुष्को वा श्रुतिसङ्ख्यो भवेत् स्वरः । अनीरणात्तु शेषाणां स्वराणामपि सम्भवः । अङ्गुलीवादनकृतं तच्च मे सन्निबोधत ॥ ४ ॥
A note may consist of two, three, or four Śrutis. For the remaining notes, even though not blown (i.e., unplayed), they are still possible. Understand this, as it is created by finger placement while playing the flute.
english translation