Find the shortest route from Node 1 to Node 4. 
Definitions:
Irrational Thoughts
Thoughts that are not based on reason or logic, often leading to negative emotions and behaviors.
Valium
A medication primarily used to treat anxiety, muscle spasms, and seizures by having a calming effect on the brain and nerves.
Antianxiety Drug
Medication prescribed to relieve anxiety and reduce tension and fear.
MAO Inhibitor
A class of antidepressant drugs that work by inhibiting the enzyme monoamine oxidase, thus increasing levels of certain neurotransmitters in the brain.
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