challenging [Adjective] + experience [Noun]

Strength Strength Dispersion
A:
6
CHISQ:
18.46
AWT:
23,187,760
TTEST:
1.95
G2:
12.79
FAWT:
2.34
MI:
2.28
LOGLOG:
5.9
JD:
0.53
MI3:
7.45
DICE:
0.05
RANGE: