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This example demonstrates a force-directed network graph of interconnected hubs—Email, Search Engine, OpenVas, and NFV—each with child nodes and leaf clusters. Built with D3 version 7, it uses `forceSimulation` with `forceManyBody`, `forceLink`, and `forceCenter` to position nodes, while SVG elements (`circle`, `line`, `text`) are rendered and updated on each tick. The visualization includes draggable nodes via `drag` interaction, with colors sourced from `color.js` and network data defined in `data.js`.