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Question: A hydrologist is studying a river system with 6 tributaries. She wants to select 3 tributaries to monitor closely. If two of the tributaries are near a protected wetland and must both be monitored if either is selected, how many valid selections of 3 tributaries are possible?
Let the two special tributaries be $ A $ and $ B $. The condition is: **if either A or B is selected, both must be selected**.
We must count all 3-tributary selections satisfying this rule.

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