It is acknowledged that, insofar as is possible, notice of lay-off shall be given to the teacher by certified mail no later than May 1st, such notice of lay-off to become effective as at June 30th of that school year. However, it is also acknowledged that in certain circumstances, the Division may find it necessary to provide notice of lay-off earlier in the school year and in such cases, shall provide such notice by certified mail no later than November 1st, such notice to be effective as at December 31st of the school year. The teacher within ten calendar days of receiving notice of lay-off shall indicate, in writing, his/her wish to be placed on the re-employment list. Notwithstanding anything else in this collective agreement, failure to respond within the time limit specified in this clause shall relieve the onus on the Division for that teacher’s placement on the re-employment list.