chevati_mulabhasha_structural
Chevāṭī is the mūlabhāṣā (root bhāṣā): complete, brilliant with madhyama, has ṣaḍja as graha-nyāsa, and exhibits saṁvāda between ṣaḍja-madhyama and two-śruti svaras.
Body (pseudocode)
CHEVATI = {
'role':'mulabhasha','completeness':'full',
'brilliant_with':'madhyama',
'graha':'sadja','nyasa':'sadja',
'samvada_pairs':[('sadja','madhyama'),'two_shruti_svaras']
}