The output order of function calculate.overlap

Question

I am using "calculate.overlap" function in R package "VennDiagram". I am comparing four sets of data as following:

library(VennDiagram)

overlap=calculate.overlap(
    x=list(
        "1"=1,
        "2"=2,
        "3"=3,
        "4"=4
    )
) 

The output file "overlap" consists of 15 lists. They are called:

$a6, a12, a11...  

How do I know which list belongs to which comparison?

Answer 1

By replacing x in overlap[[x]] with red number 1-15, you can get a complete list of genes of interest at the specific location in Venn diagram.

Also, you can get the numbers of genes by using length() function.