A boy and a girl are talking.
"I am a boy" - said the child with black hair.
"I am a girl" - said the child with white hair.
At least one of them lied. What is the colour of boy's hair ?
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If one of them lied, then they're not who they said they are. Because at least one is lying but their statements are consistent, then both are consistent in their lies. The real boy must have been the child who claimed to be a girl, the one with white hair.