Service Law – the employees who were appointed on adhoc basis and qualified typing test at the later stage, in absence of the scheme of rules in determining seniority, at least could not have a right to march over such of the employees who were appointed on substantive basis after going through the process of selection for holding regular selection and their right of seniority in no manner be relegated qua such of the adhoc employees who qualified typing test at a later stage and regularized subsequently from the date of initial appointment.