This example shows a static network graph with three nodes and two links. It renders circles and lines as SVG elements inside a 512-pixel square. The layout comes from `d3.forceSimulation`, manually stepping 20 ticks with `simulation.tick()`, and then positioning nodes and edges via a `ticked` function. The code uses `forceLink`, `forceManyBody`, and `forceCenter` to shape the graph, though the commented-out update logic is not active.