|Fi(A) ∩ Fi(B)| is the number of distinct sports themes shared by both games A and B
|Fi(A) U Fi(B)| is the number of distinct sports themes of games A and B
|Fi(A) ∩ Fi(B)|
Simi(A, B) = --------------------- * 100
|Fi(A) U Fi(B)|
example: game A = "NBA All-Star Challenge (SNES)", Fi(A) = ("Basketball")
game B = "Tiny Toon Adventures: Acme All-Stars (SEGA Genesis)", Fi(B) = ("Basketball", "Bowling", "Soccer / Football (European)")
|Fi(A) ∩ Fi(B)| = |("Basketball")| = 1
|Fi(A) U Fi(B)| = |("Basketball", "Bowling", "Soccer / Football (European)")| = 3
Simi(A, B) = (1 / 3) * 100 = 33
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