TSP Path: NOT Tour

It's easy to understand that Traveling Salesman Tour Problem is NPC (By
reduction from Hamiltonian Cycle). But how to understand that a
Traveling Salesman Path Problem is also NPC? Here, Tour means that the
salesman must return to the staring city, Path means that the salesman
will not return to the staring city, but just visiting each city once
and only once.

Can anybody help, please?

Thanks:)

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