low-grade [Adjective] + coal [Noun]

Strength Strength Dispersion
A:
3
CHISQ:
122.28
AWT:
21,388,797
TTEST:
1.69
G2:
24.47
FAWT:
2.54
MI:
5.42
LOGLOG:
8.58
JD:
0.43
MI3:
8.59
DICE:
0.11
RANGE: