I repeat my question again.
I have ever seen a gambling machine in casino when I was a child.
This gambling machine is trick, dices result could be decided BEFORE throwing.
It means the dices could be decided which side is up by computer, gambling machine.
I have ever seen a special and accident situation that the dices (5 dices) rolling down on the flat table, one of dices reserves to opposite side, such as 1 to 6.
It seems that the dices were controlled by magnetic material.
But, I wonder magnet only has North and south pole, how to use its principle to control dice that has 6 faces.