long-standing [Adjective] + difficulty [Noun]

Strength Strength Dispersion
A:
14
CHISQ:
251.67
AWT:
8,689,284
TTEST:
3.55
G2:
63.47
FAWT:
6.26
MI:
4.31
LOGLOG:
16.43
JD:
0.52
MI3:
11.93
DICE:
0.21
RANGE: