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Roll up, roll up, ladies and gentlemen; welcome to Scottish politics’ incredible funfair and flying circus. Wander through the hall of distorting mirrors; throw brickbats at a succession of Aunt Sallys; watch in awe as masters of illusion produce phantoms out of thin air. Then take your seat in the Big Top for a gravity-defying tightrope act that leaves even the ringmasters dumbfounded.