Which property justifies this conclusion? If X is a point on 
and R-X-S, then 
.
Definitions:
TripAdvisor
An online platform that provides reviews and recommendations for hotels, resorts, inns, vacations, travel packages, travel guides, and more.
Cap-and-Trade Program
An environmental policy tool that sets a limit on emissions and allows companies to buy and sell permits for the right to emit greenhouse gases.
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