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Basis of accounting	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Basis of accounting	1. Basis of accounting The unaudited condensed consolidated interim financial statements are prepared under the historical cost convention, except for the revaluation of certain financial instruments as disclosed in our accounting policies.

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The disclosure of the basis used for the preparation of the financial statements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2017-03-09

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