#91 — Intersection, Union, And Difference in the Case of Simple Members — Two Sets

Problem description:

The following table lists the top 10 products by sales in January and February:

• B
  . Find out the products that make the top 10 once or more:

=spl("=?1&?2",B2:B11,C2:C11)

• D
  . Find out the products that make the top 10 in February but fail to make the top 10 in January:

=spl("=?2\?1",B2:B11,C2:C11)

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