However, applications may also be invited from persons belonging to non backward class if the suitable non backward class candidate already appointed in the first year is not available for reappointment in the second or third year and or his services are required to be terminated on account of unsatisfactory performance of work in the first year; (2) That if in the second year, in response to the advertisement, a backward class candidate is not available, then the suitable non backward class candidate already appointed in the reserved post shall not be required to appear for interview before the Selection Committee again for the second 293 and: or third year (s) but that he shall be reappointed in the reserved post, if he is available for reappointment; (3) That if in response to the third advertisement in the third year, no application is received for the reserved post from candidates belonging to SC, ST, DT, or NT, the college authorities shall start the process of dereservation of the reserved post.