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There are multiple paths of execution your code but they are never running concurrently. Only the underlying I/O is really executing concurrently with your code.

Multiple paths of execution is concurrency. I guess what you intended to mean was parallelism, which is different from concurrency.

A multi-threaded program running on a single core system has only one path executed at any given time, but we still call it a concurrent program.

Concurrency is a superset and includes parallelism. What we both really mean is that it uses at most one core at a time to execute your code.


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