“Admittedly, the petitioners are working in a vocation department. The question as to whether or not the persons working in vocation departments are entitled to encash the half pay leave which was due to them at the time of their retirement, has been considered by a Full Bench and a Division Bench of this Court. On a consideration of the matter, it has been held that the rules “create a classification between the vocation departments and the other departments..... . The classification is prima facie reasonable.... . The petitioners prior to their retirement from service were working in the Education Department where the facility of vacation is admittedly available. As such, they were not entitled to earned leave except when they were unable to avail of the full vacation. Having not got any earned leave to their credit, they cannot claim the benefit of encashment under the provisions of rule 8.21. For the purpose of encashment, only earned leave is to be taken into consideration. Consequently, no benefit can be granted to the petitioners.”