difficult [Adjective] + problem [Noun]

Strength Strength Dispersion
A:
279
CHISQ:
244.2
AWT:
619,677
TTEST:
9.92
G2:
175.07
FAWT:
87.72
MI:
1.3
LOGLOG:
10.56
JD:
0.92
MI3:
17.55
DICE:
0.73
RANGE: