Fig 4. Venn diagrams and Nested Venn in VennPainter.

(a) Classic Venn diagram depicting from one to five datasets. (b) Edwards’ Venn diagrams for from two to six datasets. (c) Nested Venn diagrams showing from five to eight variables. Nested Venn diagrams uses single-level Classic Venn diagrams to construct multi-level ones, which are easier to interpret than other forms of Venn diagrams when the datasets reaches more than six.