54 The following arguments were advanced in support of the Seller's contention that it was not in default by failing to provide documents which provided evidence of the registration of the transfer of the Rick Hart Lease to Lesandu. First, it is said that cl 4.2(c), on its proper construction, is concerned with the provision of documents at settlement, and is not concerned with the very different concept of registration of leases or of other instruments relating to the leases. Second, it is said that the effect of the construction for which the Purchasers contend would be to, in effect, render the Sale Contract conditional, at the election of the Purchasers, upon the Seller procuring registration of documents relating to the leases, and that this conclusion is not justified by the language of the Sale Contract, and in particular, cl 4.2(c). Third, it is contended that cl 3.1 defines the extent of the Seller's obligation with respect to the transfer of the leases, and that clause does not in terms require the Seller to procure registration of the transfer of the Rick Hart Lease to Lesandu. Fourth, it is argued that because cl 4.2(c) only entitles the Purchasers to request the provision of documents that are reasonably required, the right should not be construed as extending to documents which will require the cooperation or action of third parties over whom the Seller has no control, such as the Registrar of Titles, or the parties to the assignment of the Rick Hart Lease.