4 prisoners are are given a hat each from 2 blue and 2 yellow hats. Find out who will shout first and declare his own hat color?
All know that there are 2 blue and 2 yellow hats. They do not know their own hat color. 4 can see 3 and 2s hat color 3 can see 2s hat color and 1 can see only the wall. No speaking or touching. No mirrors. No movements.
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