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where the property is a share of the capital stock of a joint exploration corporation resident in Canada and the taxpayer has, after 1971, made a contribution of capital to the corporation otherwise than by way of a loan, which contribution was included in computing the adjusted cost base of the property by virtue of paragraph 53(1)(c), such portion of the contribution as may reasonably be considered to be part of an agreed portion (within the meaning assigned by subsection 66(15)) of the corporation’s