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*This period of time is doubled in an international arbitrati­on (art. 5(2)).

8. If the Executive Board rejects the challenge, the challen­ging party may bring the grounds for the challenge before the court.

9. If the challenged arbitrator withdraws or if the challenge is upheld by the Executive Board or by the court, the arbitra­tor shall be replaced in accordance with the provisions of article 18(1). The provisions of article 18(2) shall apply accordingly.