Table 1 Grading rubrics of SCS

grade 1

2

1 + 1 = 2

Only pattern A, LVI negative

3

1 + 2 = 3, 2 + 1 = 3

Mixture of pattern A and pattern B, LVI negative

grade 2

4

①1 + 3 = 4, 3 + 1 = 4

①Mixture of pattern A and pattern C, LVI negative

②2 + 2 = 4

②Only pattern B, LVI negative

③1 + 2 + 1 = 4, 2 + 1 + 1 = 4

Mixture of pattern A and pattern B, LVI positive^a

5

①2 + 3 = 5,3 + 2 = 5

At least pattern B and pattern C emerge (with or without pattern A), LVI negative

②2 + 2 + 1 = 5

Only pattern B, LVI positive^a

③1 + 3 + 1 = 5, 3 + 1 + 1 = 5

Mixture of pattern A and pattern C, LVI positive^a

grade 3

6

①3 + 3 = 6

Only pattern C, LVI negative

②2 + 3 + 1 = 6, 3 + 2 + 1 = 6

At least pattern B and pattern C emerge (with or without pattern A), LVI positive^a

7

3 + 3 + 1 = 7

Only pattern C, LVI positive^a