sentences:  Sāma created on richa-s of Āranyak Samhita are termed Aranya-gāna अरण्यागान or Aranyageya-gāna अरण्यगेयोगान्.Sām created on richa-s of Uttarārchik are known as Ooha-gāna.ऊहगान्
  The Sanskrit root ooh means 'to modify according to need'.