I'm only a student of grappling from home DVD's but it just amazes me how many combinations and variations there really are on the ground. When I used to read old ju-jutsu books and they claimed that there is literally an endless amount of combinations and techniques I don't think they had ground fighting in mind.

But ground fighting itself really does seem to be a complete art in itself with infinite possibilities. And coupled with old stand up ju-justu it really is a complete art.
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"Poor is the pupil who
does not surpass his
master" - Leonardo Da
Vinci