The three divisions of the Noble Eightfold Path
MN 44:
Class of Wisdom (Sanskrit: prajñā, Pāli: paññā): Right view, Right thought
Class of Morality (Sanskrit: śīla, Pāli: sīla): Right speech, Right action, Right livelihood
Class of Concentration (Sanskrit and Pāli: samādhi): Right effort, Right mindfulness, Right concentration
MA 210 (T1, p. 788c):
Class of Wisdom: Right view, Right thought, Right effort
Class of Morality: Right speech, Right action, Right livelihood
Class of Concentration: Right mindfulness, Right concentration
(See pp. 44, 111-112, note 149 in The Notion of Emptiness in Early Buddhism by Choong Mun-keat).