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  1. Drop vertical from A

  2. Create seven equal divisions along the vertical

  3. Swing a circle from the third division with the divider set to A

  4. Bisect the circle to create a horizontal

  5. Erect a perpendicular along the horizontal at the right side of the circle

  6. Establish P on the perpendicular from the height of the horizontal above the baseline

  7. Swing from P with the divider set to the baseline to complete the semi-elliptical curve