Sum Method Followed by Maximum Method: This diagram shows the following calculations in a grid format:

• Row 1: 4+4+na=8

• Row 2: 1+8+6=15

• Row 3: 2+3+7=12

• Column 1: Maximum of {4, 1, 2} is 4

• Column 2: Maximum of {4, 8, 3} is 8

• Column 3: Maximum of {na, 6, 7} is 7

• Column 4 (aggregates from SUM): Maximum of {8, 15, 12} is 15