precedure under (1) and (2) shall be applied mutatis mutandis until the selection of the arbitrator from the arbitrator list of the Office can not be made. If the Office is of opinion that there is not a

list. If the Office is of opinion that there is a reasonable ground for the challenge, the precedure under (1) and (2) shall be applied mutatis mutandis until the selection of the arbitrator from the

list. If the Office is of opinion that there is a reasonable ground for the challenge, the precedure under (1) and (2) shall be applied mutatis mutandis until the selection of the arbitrator from the