Rudiments - Standard and hybrid + their inversions

[extra-solar]

How many rudiments (Standard and hybrid + their inversions) are there?

Infinte? Can they be grouped into their root formulas/patterns?

[Wavelength]

All rudiments are made of singles doubles, flams, drags and buzzes, and there are literally infinite combination possibilities -- just when you think you've got them all down, you can always add yet another stroke...