perennial [Adjective] + difficulty [Noun]

Strength Strength Dispersion
A:
6
CHISQ:
101.63
AWT:
17,156,018
TTEST:
2.32
G2:
29.99
FAWT:
3.17
MI:
4.24
LOGLOG:
10.95
JD:
0.6
MI3:
9.41
DICE:
0.09
RANGE: