| 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. | 
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