You fill the nine numbers - 2, - 1, 0, 1, 2, 3, 4, 5, 6 into the nine spaces in the graph, so that the three numbers in each row, the three numbers in each column, and the three numbers in diagonal angles add up to 6

You fill the nine numbers - 2, - 1, 0, 1, 2, 3, 4, 5, 6 into the nine spaces in the graph, so that the three numbers in each row, the three numbers in each column, and the three numbers in diagonal angles add up to 6

According to the analysis, it can be concluded that: