Find all the second partial derivatives. 
Definitions:
Reroute Trains
The process of changing the predetermined path or direction of train services due to operational, safety, or construction reasons.
Railroad's Tracks
The physical infrastructure consisting of the steel rails on which trains run, crucial for the transport of goods and passengers over land.
Credit Counseling
A service that offers guidance on how to improve credit scores and manage debt effectively.
Not-for-profit Organization
A not-for-profit organization is a type of organization that does not earn profits for its owners but uses the funds for its goals.
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