that is ,find the engineer who found the greatest number of defects that no one else found. Then put that engineer's data in column A. In this example, engineer DB is the only one who found the defect on line 12. Every other defect he found was also found by one or both of the other engineers. The number of his unique defect is thus 1. Similarly,engineer BP is the only one who found the defects on line 15 and 35,and engineer PA found no unique defects.Because engineer BP found the most unique defects,copy his data in to the A column.Next,combine the data for the other two engineers and treat the combination as engineer B.