Question: In R, suppose data frames x and y have only the variable `ID` in common. Suppose x has 5,000 rows and y has 10,000 rows.

In R, suppose data frames x and y have only the variable `ID` in common. Suppose x has 5,000 rows and y has 10,000 rows. Finally, suppose that every ID in x is also in y. How many rows will semi_join(x, y) have?

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