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"All options remain on the table", goes the mantra. This is code for saying that the West retains the choice of using military force to stop Iran acquiring a nuclear weapon. We’ll hear it repeated this week, as negotiations between Iran and the “P5 +1” (the permanent members of the United Nations Security Council, and Germany) resume in Kazakhstan. On occasions, I’ve used the phrase myself. But the more I’ve thought about it, the more I’ve become convinced that it is a hindrance to negotiations, rather than a help.