By Alun John HONG KONG (Reuters) – The Australian dollar marched higher and the Japanese yen continued its slide on Wednesday, as markets turned more positive on riskier assets and high commodity prices drove developments. The Australian dollar hit its highest level since December 2015 versus the yen, having gained 8% in March so far. Versus the dollar, the Australian dollar touched a four and-a-half month high of $0.7477 in early trade, having gained 0.95% overnight, while the yen slipped to as low as 121.4 per dollar after the dollar had climbed 1.1% on the Japanese currency overnight. The A…

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