Jarc
Uh huh, we get it, yup, yeah, you too.

ThaShiveGeek
MetaSkipper
Gilbagz
AA25Mamba
Here ya go, if this benefits anyone. I realize this probably isn't new information to most people, but I wanted a clean graphic for my own reference. Enjoy.
Note 1: 21* refers to the second natural hit of the 21 string (3rd overall hit)
Note 2: This chart diagrams the worst-case scenario. There are circumstances where some things will hit unexpectedly (i.e. defender blocks 2 standing, crouches for the subsequent 1* & has to block both hits when normally the second would wiff). This chart is meant to establish a rule of thumb & advise appropriate caution in relevant match-ups.