A(4) * B(5) = 20
A(4) * C(10) = 40
A(4) * D(2) = 8
A(4) * E(9) = 36
B(5) * C(10) = 50
B(5) * D(2) = 10
B(5) * E(9) = 45
C(10) * D(2) = 20
C(10) * E(9) = 90
D(2) * E(9) = 18