In Dotland, people have dots on their foreheads. The dots come in two colors, red and blue. If anyone figures out what color dot they have on their forehead, they commit suicide.
The residents of Dotland have a tradition. Everyday they gather at the town-hall.
Everyone in Dotland is really smart. So if it is possible for them to figure out what color they have, they will figure it out.
It is given that at least one of them has a red dot and at least one of them has a blue dot.
Prove that they will all commit suicide.
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