That one at first becomes a Brahmana and then becomes a Kshatriya, A Vahika after that will become a Vaishya, then a Sudra and then a barber.
तत्र वै ब्राह्मणो भूत्वा ततो भवति क्षत्रियः। वैश्यः शूद्रश्च वाहीकस्ततो भवति नापितः॥