Yes, we can do pair-wise, A and B, A and C, A and D, but what about A, B, C, D, E, F, G all together, being taken by the same patient, perhaps interacting with each other in ways that either makes them more effective or less effective or causes side effects that are unexpected?
Si, podemos comparar por pares, A e B, A e C, A e D, pero que pasa con A, B, C, D, E, F, G xuntos, cando os toma o mesmo paciente, quizais interactuando entre eles en modos que os fan  máis eficaces ou menos ou que causan efectos secundarios  inesperados?