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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Wrong and confusing formula in example in description:
S = S(R1) + S(R2) + S(R3) - S(R1 ∩ R2) - S(R1 ∩ R3) - S(R2 ∩ R3) = 36
It should be either general formula:
S = S(R1) + S(R2) + S(R3) - S(R1 ∩ R2) - S(R1 ∩ R3) - S(R2 ∩ R3) + S(R1 ∩ R2 ∩ R3) = 36
Or formula specific to example where unions of value 0 are not shown:
S = S(R1) + S(R2) + S(R3) - S(R1 ∩ R2) = 36
what i can understand is that generall gist is draw concentric squares + change little differences