Janaka rāgas are grouped together using a scheme called "Katapayadi sutra" and are organised as "Melakarta" rāgas. A Melakarta rāga is one which has all seven notes in both the ārōhanam (ascending scale) and avarōhanam (descending scale). Some "Melakarta" rāgas are "Harikambhoji", "Kalyani", "Kharaharapriya", "Mayamalavagowla", "Dheerasankarabharanam" and "Hanumatodi". Janya rāgas are derived from the Janaka rāgas using a combination of the swarams (usually a subset of swarams) from the parent rāga. Some janya rāgas are "Abheri", "Abhogi", "Bhairavi", "Hindolam", "Mohanam" and "Kambhoji".