But though a test will have to be set before Sinn Fein can be readmitted, it should not at this stage be impossibly stiff.

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In those circumstances, austerity programmes would become a prison with impossibly high walls, not a route back to rehabilitation and credibility in the eyes of commercial investors.

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It seems impossibly stupid, but not entirely unreasonable.

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This point is not made to be critical or bash the experts, but to point out how impossibly difficult it is to be consistently correct, particularly when it comes to the stock market.

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