1. Counterparties shall clear all OTC derivative contracts pertaining to a class of OTC derivatives that has been declared subject to the clearing obligation in accordance with Article 5(2), if those contracts fulfil both of the following conditions:
(a) they have been concluded in one of the following ways:
(i) between two financial counterparties that meet the conditions set out in the second subparagraph of Article 4a(1);
(ii) between a financial counterparty that meets the conditions set out in the second subparagraph of Article 4a(1) and a non-financial counterparty that meets the conditions set out in the second subparagraph of Article 10(1);
(iii) between two non-financial counterparties that meet the conditions set out in the second subparagraph of Article 10(1);
(iv) between, on the one side, a financial counterparty that meets the conditions set out in the second subparagraph of Article 4a(1) or a non-financial counterparty that meets the conditions set out in the second subp
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