By Alun John HONG KONG (Reuters) – The yen dropped to a new 20-year low versus the dollar on Thursday, and the euro inched higher ahead of a highly-anticipated meeting of the European Central Bank, which should offer insights into its monetary policy tightening plans. The ECB is all but certain to flag an end to its long-running asset purchase programme at the end of this month, and promise a rate hike for July, but the size and pace of its tightening are uncertain. Speculation is growing that red hot euro zone inflation could push the ECB into kicking off its hike campaign with a large 50 bas…

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