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+
+
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Equation NOT balanced
Easy
Intermediate
Expert
A-Level AS
A-Level A2
