0
1
2
3
4
5
6
frequency
signed score
−
2
-2
−
2
4
4
4
9
9
9
0
4
10
18
0
0.2
0.4
0.6
0.8
x
x
x
frequency density
20
35
0
1
2
3
x
x
x
frequency density
12
20
35
0
2
4
time
t
t
t
frequency density
ESAT
Genius
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Mathematics 1 · Statistics
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