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                      new go.Shape({
                        geometryString: 'M0 0 V12',
                        stroke: 'white',
                        strokeWidth: 2,
                        interval: 2
                      }),
                      new go.Shape({
                        geometryString: 'M0 0 V15',
                        stroke: 'white',
                        strokeWidth: 3,
                        interval: 4
                      }),
 