"16. The question as to whether a teacher appointed on short term basis pursuant to the provisions of Second Order has a right to continue if subsequently the vacancy becomes substantive, specifically came up for consideration before a Full Bench in Smt. Pramila Mishra Vs. Deputy Director of Education, 1997 (2) ESC 1284 (All)(FB) and on page 1291 the Court held that "from the provisions of the Acts, Rules, Regulations and Removal of Difficulties Orders discussed above, it is manifest that a clear distinction has been maintained between substantive vacancy and short term vacancy of the post of a teacher. The authority to make the appointment, the procedure to be followed in making the appointments and the considerations to be made in making the appointment in the two cases are distinct and different from each other. In each case the duration of ad hoc appointment is also laid down under the statutory provisions. In the case of ad hoc appointment in a short term vacancy paragraph 3 of the Second Order specifically lays down that the appointment will come to an end if the short term vacancy otherwise ceases to exist. It follows, therefore, that when a vacancy caused due to grant of leave to or suspension of the permanent incumbent becomes a substantive vacancy on account of his death, resignation or termination or removal from service, the short-term vacancy ceases to exist and a substantive vacancy is created in its place. On a perusal of the relevant provisions of the Acts, Rules, and Removal of Difficulties Orders and giving our anxious consideration to the matter, we do not find any provision which directly or even indirectly vests a right in a person appointed an ad hoc teacher in a short-term vacancy to continue even after the said vacancy has ceased to exist and a substantive vacancy has been created in its place. The contention raised on behalf of the respondents that such an appointee (in short-term vacancy) is entitled to continue in the post (substantive vacancy) till a candidate selected by the Commission/Board joins the post does not get any support from the statutory provisions and, therefore, cannot be accepted. The contention is also not acceptable for the reason