Table:
factors
f1
f2
f3
f4
f5

f1. emotional symptoms
..
..
..
..
..

f2. conduct problems
0.37
..
..
..
..

f3. peer problems
0.41
0.34
..
..
..

f4. hyperactivity
0.36
0.56
0.34
..
..

f5. prosocial behaviour
-0.20
-0.46
-0.27
-0.36
..

Statement: correlations with other factors were positive among four difficulties factors, which are emotional symptoms, conduct problems, peer problems and hyperactivity.
Question: which difficulties factors has positive correlations among all five factors?
Answer: f1. emotional symptoms, f2. conduct problems, f3. peer problems, f4. hyperactivity