This is a chart showing fruit sales. Customers can buy an apple, a
lime, and/or a blueberry. I'm creating a venn diagram to see how many
customers buy a signle thing, or multiple things.

In my data, no customers bought a lime and a blueberry in the same
shopping cart.
They bought apples & limes, or apples & blueberries, or apples &
blueberries & limes, but not only limes & blueberries.
They also bought each fruit by itself.

My data points:
64 apples
42 limes
50 blueberries

Intersection between apples and limes: 20
Intersection between apples and blueberries: 27
Intersection between limes and blueberries: 18

Intersection between all 3: 18


The chart:
http://chart.apis.google.com/chart?chs=500x500&cht=v&chco=FF6342,ADDE63,63C6DE&chd=t:64,42,50,20,27,18,18&chdl=Apples|Limes|Blueberries&chdlp=b&chtt=Venn%20Chart%20Weirdness

Why does the venn chart show an intersection between limes and
blueberries, if the intersection size of limes and blueberries is
exactly the same size as the intersection between all 3?

Is this a limitation of Venn charts?

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