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When there is more than one possible solution to creating geometry (for example a circle tangent to two lines will have 4 possible solutions), then the option parameter is used to define which solution you want to select. There is no simple way of describing which solution results from each option, but you can be assured that the calculations are based upon the direction of the lines and circles and the order in which you specify these in the macro command. So once you have found which option youe need, then the same geometry will be created each time.