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  1. Swing arcs from A and B with divider set to A-B; mark intersection C

  2. With the same divider setting swing from C; mark intersections E, F

  3. Extend line from A→F, mark H; from B→E, mark G

  4. Set divider to A-G; swing from focus G, mark J, swing from focus H, mark K

  5. Connect points A→J, J→K, K→B. AJKB is a square