A ['A1', 'A2', 'A3']
I ['I1', 'I2', 'I3', 'I4']
U
U[A1,I1] 1.3
U[A1,I2] 1.4
U[A1,I3] 1.5
U[A1,I4] 1.6
U[A2,I1] 2.3
U[A2,I2] 2.4
U[A2,I3] 2.5
U[A2,I4] 2.6
U[A3,I1] 3.3
U[A3,I2] 3.4
U[A3,I3] 3.5
U[A3,I4] 3.6
