Decision on a motion for clarification lacking the signature of one of the arbitrators. Certification by the president of the arbitral tribunal that all arbitrators participated in the decision, with the absence of signature being due solely to the subsequent impossibility caused by the arbitrator's illness, who later passed away. Absence of evidence of incapacity to exercise jurisdiction. No nullity under Article 26, sole paragraph, of the Brazilian Arbitration Act and the arbitration rules of the arbitral institution: