The conditions in the second part of the proviso are as follows: 1) If a candidate (who is permitted to appear in the next CSE (Main) on fulfillment of the conditions, enumerated in the first part of this proviso) is allocated to a service on the basis of the next Civil Service (Main) Exami nation, he should either join 74 that service or the service to which he has already been allocated on the basis of the previous CSE; 2) If the candidate fails to join either of the services as mentioned in the first condi tion of this second part then his allocation to the service based on one or both examina tions, as the case may be, shall stand can celled; and 3) Notwithstanding anything contained in Rule 8, a candidate a) who accepts allocation to the service and b) who is appointed to a service shall not be eligible to appear again in CSE unless he has first resigned from the service.