0, 1, 2, 3, 4, 5, 6, 7, 8, 9.	|classes


S1 : 1, 2, 3, 4
C1 : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
S2 : 1, 2, 3, 4
C2 : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
S3 : 1, 2, 3, 4
C3 : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
S4 : 1, 2, 3, 4
C4 : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
S5 : 1, 2, 3, 4
C5 : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13