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C1 = (s2,s3,m3,w3), with centroid(z) = s2

...

we skip including this: sim(s2,s2)=1
We never compare a centroid with itself.

C2 = (s3,m1,w3), with centroid(z) = w3

...
   Total = 0.9
   |C2| = 3
Density = Total/|C2| = 0.9/3= 0.3