text: I hope this is clear. Okay, so ಯಾವ elements ಮಕ್ಕಳೇ? The set of all second elements, we want to consider the set of all second elements of the ordered pairs in the relation R. So ಇದರಲ್ಲಿ ಮಕ್ಕಳೇ, first one ಇದರಲ್ಲಿ, first elements of the ordered pairs in the relation is called as domain.