intractable [Adjective] + difficulty [Noun]

Strength Strength Dispersion
A:
3
CHISQ:
10.12
AWT:
24,136,065
TTEST:
1.4
G2:
8.6
FAWT:
2.25
MI:
2.37
LOGLOG:
3.76
JD:
0.43
MI3:
5.54
DICE:
0.05
RANGE: