There are four track projects in the school track and field sports meeting: 100m, 200m, 400m and 800m  There are three boys Jianguo, Xiaojie, Daniu and three girls Dandan, Xiaoying and Shuzhen in Class 2  There are two rules for the Games: (1) every project must be attended by men and women at the same time or not at the same time
(2) each person can only participate in one project
Jianguo participate in 100m.