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GLASGOW, SCOTLAND - FEBRUARY 01: Ian Black of Rangers is challenged by Stefan Johansen of Celtic during the Scottish League Cup Semi-Final between Celtic and Rangers at Hampden Park on February 1, 2015 in Glasgow, Scotland. (Photo by Jamie McDonald/Getty Images)

GLASGOW, SCOTLAND - FEBRUARY 01:  Ian Black of Rangers is challenged by Stefan Johansen of Celtic during the Scottish League Cup Semi-Final between Celtic and Rangers at Hampden Park on February 1, 2015 in Glasgow, Scotland.  (Photo by Jamie McDonald/Getty Images)