I have a friend that does Parker Kenpo. Looks like the stuff. They work with these combinations like that, 200 odd I think. The Parker ones are the 'special' stuff needed to make the system. It came from Okinawian influence in Hawaii, so it has a bit more of the chinese flavour than regular Karate. In my humble opinion.
People add all kinds of additional training depending on their own thinking.
Guangzhou Pak Mei Kung Fu School, Sydney Australia,
Sifu Leung, Yuk Seng
Established 1989, Glebe Australia