challenging [Adjective] + problem [Noun]

Strength Strength Dispersion
A:
9
CHISQ:
11.12
AWT:
14,423,346
TTEST:
1.96
G2:
9.56
FAWT:
3.77
MI:
1.53
LOGLOG:
4.84
JD:
0.68
MI3:
7.87
DICE:
0.03
RANGE: