What is the constraint for node 2 in the following shortest path problem? 
Definitions:
Testable Prediction
A statement forecasting a specific outcome that can be verified through experimentation or observation, fundamental in the scientific method.
Hypothesis
A proposed explanation for a phenomenon, made as a starting point for further investigation.
Empiricism
The theory that knowledge comes primarily from sensory experience and that scientific methods should rely on observation and experimentation.
Variable
Something in the world that can vary and that a researcher can manipulate (change), measure (evaluate), or both.
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