During the National Games, there were 8 athletes living in Building F. One of them was Heilongjiang, two were northerners, one was Cantonese, two were track and field athletes, and three were main athletes. Arrived at all 8 athletes in the F building. Which of the following contradicts the information stated in the question? ['Heilongjiang athletes are not main players;.', 'Track and field athletes are not main players;.', 'Cantonese are the main players;.', 'The main players are all Southerners.']