16 trees are arranged in four or four squares, and the other four trees are arranged outward from the midpoint of each side in a square placed at 45 degrees.

In this way, four horizontal lines, four vertical lines, two diagonal lines, plus four sides and four diagonal lines are discharged, making a total of 14 lines.

Extended data:

① A row (or a column) in determinant A is multiplied by the same number k, and the result is equal to kA.

② determinant a is equal to its transposed determinant at (the I-th row of at is the I-th column of a).

③ If there is a row (or a column) in the determinant of order n |αij|; The determinant |αij| is the sum of two determinants, where the first row (or column) is B 1, B2, ..., bn; The other is с 1, с 2, …, с n; The elements in other rows (or columns) are exactly the same as those in |αij|.

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