What's the most efficient way of locating someone based off knowing their location relative to someone else?

What's the most efficient way of locating someone based off knowing their location relative to someone else?
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1 Answer

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A simplified version of having 3 people and you know the distance of A and B and know C only in terms of closer or further away from A and B, would also be interesting to know if only having 2 people is too difficult.
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