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We're seeing a perfect storm of the kind of negativity that feeds into people's fears and underscores the dangers lurking in a market where sentiment is very sensitive, it's unsurprising the yen's recent weakness has reversed given the sour macro sentiment arising from events like the natural disaster, the failure of the OPEC meeting to follow through on the encouraging promise it had shown, as well as smaller geopolitical risks like the impeachment going on in Brazil.