R_980_chevati_structure
Chevāṭī: ṣaḍja as aṁśa+nyāsa, complete, weak in dhaivata, concert ṣaḍja-madhyama & ṣaḍja-gāndhāra
Body (pseudocode)
DEFINE chevati_spec():
RETURN {amsa: Sa, nyasa: Sa, complete: TRUE, weak: [Dha],
concord: [(Sa, Ma), (Sa, Ga)]}