From: Testing adequacy for DNA substitution models
Type A:
XXXX;
4 bins
Type B:
XXYY, XYYX, XYXY;
6 bins
Type C:
XXXY, XYXX, XXYX,
YXXX;
12 bins
Type D:
XXYZ, XYZX, YZXX,
XYXZ, ZXYX, ZXXY;
Type E:
XYZW.
1 bin