Any teacher employed by the Division on a Limited Term Teacher – General contract for two successive full school years shall, on employment for the third consecutive school year, be signed to a Teacher General contract and shall be deemed to have been employed under a Teacher General contract since the commencement of his or her successive duties under a Limited Term Teacher – General contract, and shall be entitled retroactively to seniority and sick leave. There shall not be more Limited Term Teacher - General contracts than the number of teachers on leave.