The king of an unknown kingdom wasn't judging his prisoners in a court of law, but he was giving them a test designed by himself.
During a riot, 3 men were captured and brought in front of the king. That was the test that the men had...
The prisoners were blindfolded and taken on a plain field where 5 poles were planted, 3 of them were white and two of them were black. The poles were one behind another, in a straight line from east to west. The prisoners are tied to the poles from west to east. All of them are facing the west. When the blindfolds were removed, the prisoners could see only the poles in front of them.

The king says:
"There are 3 white poles and 2 black poles. I will ask each of you:
Is the pole you are tied of black? and you may answer with
Yes,
No, or
I don't know.
If one of you answers with
Yes or
No and it is correct than you are all free.
If one of you answers with
Yes or
No and it is
not correct than all of you will die.
If all of you answer with
I don't know than all of you will spend the rest of your lives in prison."
The king will first ask X, then Y and then Z. The answers are heard by all of them.
What will each of them answer and why? Will they be freed or they will die executed or in prison?
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