B[0] = 0
B[1] = 2
B[2] = 4
B[3] = 6
B[4] = 8
B[5] = 10
B[6] = 12
B[7] = 14
B[8] = 16
B[9] = 18

A[0] = 0
A[1] = 3
A[2] = 6
A[3] = 9
A[4] = 12
A[5] = 15
A[6] = 18
A[7] = 21
A[8] = 24
A[9] = 27