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https://i.guim.co.uk/img/media/afa9075133bcee1b71ea1ef8fca74f545638628b/0_0_5500_3301/master/5500.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom,left&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&s=f25958f0760be4f9c0d9ac5e6341236aUS dollar hits five-year highs against Canadian currency as Japan’s Nikkei index swings between losses and gains