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duplicate

duplicate

					console.log(duplicate([1,2,3]));
					// → [1, 1, 2, 2, 3, 3]
					console.log(duplicate([1,2,55,'INNA',3]));
					// → [1, 1, 2, 2, 55, 55, "INNA", "INNA", 3, 3]
				
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