1. Example 7.1: Sample data using d3.range() function

   1. x: d3.forceX()
   2. y: d3.forceY()
   3. collide: d3.forceCollide()

2. Example 7.2: Nodes and Links in Strongly Connected Network

   1. link: d3.forceLink()
   2. charge: d3.forceManyBody()
   3. collide: d3.forceCollide()

3. Example 7.3: Making a function to load network using

   1. link: d3.forceLink()
   2. charge: d3.forceManyBody()
   3. collide: d3.forceCollide()

4. Example 7.4: Applying strength and distance

5. Example 7.5: Applying zoom interaction

6. Example 7.6: Styling and adding marks

7. Example 7.6: Grouping and Mouse interaction

For more examples: https://github.com/d3/d3-force