651868
1B 2B 5B 7B 8C 9D 10C 12D 13B 14D 15C 17D 18D 19C 20B 21B 22C 23D 24D 25D 26BCD 27AB 28BCD 33BC 34ACD 35AC 36BCD 37ABC 40ABD
2D 3D 4A 5C 6A 8D 9A 12ABC 13CD 14ABCD 15ABC
1C 2D 3C 4D 5D 8B 9D 13ABC 14ACD
https://courses.gxou.com.cn/course/1472/task/48942/show#
