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  1. Swing arc below line from focus B; above line from focus A

  2. Set compass to any width and swing through arcs, mark intersections C and D

  3. Extend lines from A through D; B through C

  4. To make a 2:3 ratio, step off three spaces (any dimension) along AD and two spaces along BC

  5. Connect the third mark on AD with the second mark on BC to complete the 2:3 ratio between A and B