long-standing [Adjective] + difficulty [Noun]

Strength Strength Dispersion
A:
9
CHISQ:
36.11
AWT:
13,762,185
TTEST:
2.49
G2:
20.52
FAWT:
3.95
MI:
2.54
LOGLOG:
8.06
JD:
0.5
MI3:
8.88
DICE:
0.13
RANGE: