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There are story books and science books in the corner of four classes in the fourth grade of experimental primary school. Please complete the program table as follows.
( 1)

(2)① In the statistical chart, each grid represents two books.

② 18 & gt; 15 >8>6, so there are the least science books and the most story books.

18- 12=6 (Ben)

A: There are the least science books and the most story books, and the minimum ratio is 12.

So the answer is: 2, technology, story, 12.