I had to do pretty extensive CF list modifications in one of my projects the other day. To do that, I used the good old Venn diagram metaphor to work with sets and AND, OR, NOT operators – made my life much easier.
Why I’m writing this: while dealing with it, I remembered back to primary school when we were introduced to basic Venn diagrams (for 7 or 8 year olds…) – using a plastic template to draw the Venn sets with red triangles, blue squares or green apples 
And funny enough, they are still available today, you can now even order them online. Exactly the same as 25 years ago – I had the red one
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