Write out the first four terms in the sequence. 
Definitions:
Airports
Complexes that facilitate air transport, including runways, terminals, and support services for passengers and cargo.
Rail
A mode of transport that uses trains and railway tracks to move goods and passengers from one location to another.
Mumbai Dabbawalas
A renowned lunchbox delivery and return system in Mumbai, India, known for its efficiency and accuracy in delivering home-cooked food to office workers.
Train Station
A facility on a railway line where trains regularly stop to load or unload passengers and/or freight.
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