The flute writing in both Čáry (2004 - 2006) and Sekka (2006 - 2007) uses an array of shape noteheads to show different types of attack in the breath. Triangle noteheads indicate an attack in t- or ts- or tš-. Square noteheads indicate an attack in p- or ps- or pš-. And semicircle noteheads indicate an attack in k- or ks- or kš-. Vertical position on the staff distinguishes the three different type of triangle attacks from one another; likewise for square and semicircle attacks.
Here're measures 23 and 24 from Sekka.

The notes towards the top of and above the staff with slashed, upward-pointing stems give twelve attacks. The complete sequence is 1/8, p, t, 7/16, tṣ, ts, tš, ps, ts, ts, ps, pṣ, k, k.
All attacks come towards the top of or above the staff. Different ways of holding out the breath after initial attack are indicated by the round of diamond noteheads towards the middle of the staff.
Here're measures 23 and 24 from Sekka.

The notes towards the top of and above the staff with slashed, upward-pointing stems give twelve attacks. The complete sequence is 1/8, p, t, 7/16, tṣ, ts, tš, ps, ts, ts, ps, pṣ, k, k.
All attacks come towards the top of or above the staff. Different ways of holding out the breath after initial attack are indicated by the round of diamond noteheads towards the middle of the staff.
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