sustained [Adjective] + challenge [Noun]

Strength Strength Dispersion
A:
4
CHISQ:
10.16
AWT:
18,594,077
TTEST:
1.54
G2:
8.69
FAWT:
2.92
MI:
2.11
LOGLOG:
4.21
JD:
0.39
MI3:
6.11
DICE:
0.12
RANGE: