toughest [Adjective] + challenge [Noun]

Strength Strength Dispersion
A:
9
CHISQ:
478.09
AWT:
23,321,975
TTEST:
2.95
G2:
62.82
FAWT:
2.33
MI:
5.78
LOGLOG:
18.33
JD:
0.61
MI3:
12.12
DICE:
0.28
RANGE: