On the Subject of The Triangle Button

This may seem like acute module, but that's not right. In fact, such a presumption is quite obtuse.

Grid A

Red
(X/0)
Green
(0/X)
Purple
Tap
Brown
(0/X)
Orange
Tap
Blue
(X/0)
Grey
Tap
Pink
(X/0)
White
(0/X)

List B

1: A, E, I, O, U
2: Y, W
3: J, Q, X, Z
4: R, S, T, L, N
5: B, C, D, F, G
6: H, K, M, P, V