| createVennObj | Create nVennObj from scratch |
| exampledf | Example data frame. |
| getVennRegion | Get elements in a region |
| listVennRegions | List elements in every region |
| plotVenn | Create Venn diagram using the nVenn algorithm. |
| setVennRegion | Set number of elements in a region |
| showSVG | Show Venn diagram. Automatically called from plotVenn. |