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a year ago
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Indexable
          (N)
       +--------+
       |   2    | N ∩ (not A or S)
   +----+    +----+        (S)
   |  S ∩ N (2)|S ∩ N ∩ A(1) |
   +----+    +----+    +----+
       | S (6)  | S ∩ A (2)| S
       |        |        +----+
       +--------+       A (0) |
       |   4    |         A ∩ (not S or N)
       +--------+

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