Moreover the fate of those Assistant Engineers who are selected and appointed in temporary posts on the basis of the results of the examination is also very uncertain inasmuch as they will be considered for selection by the Commission against the quota for temporary Assistant Engineers after the Assistant Engineers appointed before them are all considered for selection in the said quota set up for the temporary Assistant Engineers in permanent vacan cies even though they have been appointed through the same process of examination considering all these circumstances we are constraint to hold that the impugned provisions of Rule 3(c), 5 and 6 of the 1969 Rules and Rule 23 of the 1971 Rules are arbitrary, irrational an unreasonable infringing Articles 14 and 16 of the Constitution insofar as they affect the question of determining the inter se seniority of temporary Assistant Engineers appointed by the Government i.e. T category officers under rule 5(2) of the Rules as against that of D category officers i.e. officers directly recruited by the Government against permanent vacancies and placed on probation.