The Lo Shu Magic Square is a grid with 3 rows and 3 columns, shown in Figure 7-18. The Lo Shu Magic Square has the following properties:

• The grid contains the numbers 1 through 9 exactly.

• The sum of each row, each column, and each diagonal all add up to the same number.

This is shown in Figure 7-19.

In a program you can simulate a magic square using a two-dimensional list. Write a function that accepts a two-dimensional list as an argument and determines whether the list is a Lo Shu Magic Square. Test the function in a program.