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.
