Random Talking Bush's Sounds Showcase

[TrinitroMan]

So I have noticed something in the Smash 4 sound rips, specifically the sound effect part (not the voice part).
There are files called "snd_se_CHARACTER-NAME_Special_XY", "snd_se_CHARACTER-NAME_Special_C2_XY" and "snd_se_CHARACTER-NAME_Special_C3_XY", with CHARACTER-NAME being the debug name of the character, X the directional input of the special move and Y any two-digit number.
What is the difference between the normal version, the C2 version and the C3 version, and why do not all normal versions have C2/C3 versions and vice-versa? Thanks in advance!