18. An arbitration shall be deemed to have been commenced if
(a) a dispute to which the relevant arbitration agreement applies has arisen ; and |
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(b) a party to the agreement
| | (i) has received from another party to the agreement a notice requiring that party to refer, or to concur in the reference of, the dispute to arbitration ; or | | |
| | (ii) has received from another party to the agreement a notice requiring that party to appoint an arbitral tribunal or to join or concur in or approve the appointment of, an arbitral tribunal in relation to the dispute. | | |
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