Logic Flow Chart App

[hh]

One may look at that as a logic flow chart, the most compact view
I know. For example: for booleans A,B,C you have the pairwise disjoint
cases (ready for a switch)

A and B and C
A and B and not C 
A and not B and C
not A and B and C
A and not B and not C
A and not B and not C
not A and B and not C
not A and not B and C
not A and not B and not C

Each of these 2^3 cases is a segment of the three circle venn diagram.
For example ABC is displaying all elements that belong to the set A (= A is true) AND belong to the set B (= B is true) AND belong to the set C (= C is true).

Hermann