Hey there Andy,
I'd have to agree with Nick's post about the kick's. You can actually make a comparison, which is almost parallel, with the hands. In the hands you have the tan sau. From there you get all the other permutations of this hand technique. So it is also with the legs. From the tan geuk (if the term is wrong forgive me) you get all of the other permutations of this starting kick. Again, like Nick said it's all about the concept behind the kick.
A very important tip, if you don't mind, and the idea behind any kick in the system is that a horse (rooted stance) must be kept at all times when kicking for it to pocess effectiveness. The beauty of it all is that the forms themselves will give you clues as to the variations of the kicks in the system if you look carefully. It's tricky as I'm still learning were in the forms these kicks lie.
Just a couple taels from yours trully.
BTW, Nick, that was a very interesting article, thanks for sharing.
DRleungjan
It is amazing for me to understand that "unexplainable" no longer has to mean "nonexistent". pp172
Grave's End: A True Ghost Story by Elaine Mercado, R.N.