By Marc Jones LONDON (Reuters) - World shares struggled to extend a bounce off four-week lows on Tuesday, oil prices were at their highest in well over two years, while indecisive bond markets flip-flopped on inflation and interest rate moves. Europe's STOXX 600 had given back its early gains as falls in technology and healthcare stocks - the main winners from the COVID pandemic - offset a modestly higher UK FTSE with its army of oil and mining firms. [.EU] Wall Street's open also looked like being subdued after a jump on Monday, and government bond prices were choppy as fixed income investors...

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