Question: The games sports comprise all the sports in  what contest that happens every four years, that softball returned to after last being competed in 2003 at the Pan Am Ball Park, in Ajax, Ontario?
Sentence (from "Softball at the 2015 Pan American Games"): Softball competitions at the 2015 Pan American Games in Toronto was held from July 12 to 26 at the Pan Am Ball Park, in Ajax, Ontario.
Relevant evidence: No