As per Article 38 of the Statute of the International Court of Justice (ICJ), which of the following is NOT considered a source of international law?
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A. International conventions, whether general or particular, establishing rules expressly recognized by the contesting states
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B. International custom, as evidence of a general practice accepted as law
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C. Decisions of national supreme courts as a primary source of international law
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D. The general principles of law recognized by civilized nations