Possibility nomination: 3th vertical, 4th vertical, 4-5 horizontal, 3-4 horizontal
Best set is on 3th.
Just learn it by heart. To decide tertium tower is a best reason.
Even if yellow comes lately and 5th column is high, you should be patient by cut yellow.
But 4th column have to be bottom uper, it is best to use such a set like this picture.
