This example demonstrates an interactive force-directed graph layout using WebCola, with seven labeled nodes and eight links arranged into small groups. The visualization supports drag-and-drop node manipulation, where dragged nodes become fixed in place and can be released by double-clicking. Built with React and D3 v4, the code renders SVG rectangles for nodes and lines for links, with WebCola's `cola.d3adaptor` handling the layout algorithm, collision avoidance, and link distance constraints. The graph data comes from a JSON file loaded via `d3.json`.