I am confused over the arguments that you need to provide to generate a venn 
diagram<http://code.google.com/apis/chart/image/docs/gallery/venn_charts.html>, 
particularly with three groups. (Sorry, posted this in the Visualization 
API group previously but realized it should go here.)

Example:
I want to generate a venn from three groups: A={a}, B={a,b,c}, 
C={a,b,c,d,e}. Then common in A and B are 1, common in A and C are 1, 
common in B and C are 3 and common in all are 1. Therefore the data of the 
chart should be as follows: chd=t:1,3,5,1,1,3,1. However, we get this:

<https://chart.googleapis.com/chart?cht=v&chs=200x100&chd=t:1,3,5,1,1,3,1&chco=FF6342,ADDE63,63C6DE&chdl=A%7CB%7CC>

while we want this, but to get it we need to enter chd=t:1,3,5,1,1,3,0:

<https://chart.googleapis.com/chart?cht=v&chs=200x100&chd=t:1,3,5,1,1,3,0&chco=FF6342,ADDE63,63C6DE&chdl=A%7CB%7CC>


So, it is not clear to me how we need to specify the arguments. If the 
intersection arguments (4-6) are exclusive we would need to specify 
chd=t:1,3,5,0,0,2,1, but that also doesn't give a satisfactory result:

<https://chart.googleapis.com/chart?cht=v&chs=200x100&chd=t:1,3,5,0,0,2,1&chco=FF6342,ADDE63,63C6DE&chdl=A%7CB%7CC>


Who knows more about this?


Cheers!

Stefan

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