A long time ago, in one eastern country, ruled by a cruel and freakish eastern tyran, took place this curious accident.
It came in on the governor to examine the skills of his courtier wise men (he had a lot of them, of course). So, he called them all before him and spake thus:
«I has come in on me to examine the skills of my wise men, so I have contrieved the following trial for you. Tomorrow in the morning you'll be stood in a circle, facing inside, in so a manner that you'll see each other, and you'll have to keep silent for those who will open their mouth without order will be decapitated. Upon that, my servants will cover your bald heads will a cap, either green or red, and so it will be accomploshed that none of you will see the colour of your cap. Inside the circe will be my best executioner that will do thus: he'll approach one of you, at his will, and ask what colour is his cap. And that'll be the only time you're allowed to utter a single word: either "green" or "red", and If the answer is digusting to the Truth, that wise man will be immediately deprived of his status and decapitated. And so will be questioned each of you. Now it is late and I'll go to sleep, so you have this night to confer about the forthcoming trial and prepare therefor, however you decide.»
And by the morning the wise men had elaborated a way to keep the heads of most of them on the shoulders. What did they do?