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  1. Swing arc at A with divider set to B; swing arc at B with the same setting and mark intersection C

  2. With the same setting, swing arc at C

  3. Draw line from A through C and mark intersection with arc D

  4. Erect perpendicular from D through B; mark intersection E

  5. With the same setting, swing from E and mark intersection F

  6. Connect A→F→E→B to complete square