Starting point and ending point - Routing API

I have a list of locations that I would like to calculate the fastest route for. But, I do have a set starting point and a set ending point.
How could I get the API to calculate thefastest route for the other locations based on certain starting and ending points?

Do I understand correctly?
You have starting points (a1, a2, a3) and destinations (b1,b2,b3) and you’d like to know the fastest of routes a1-b1, a2-b2, a3-b3?
Or do you need all the combinations? Like a1-b1, a1-b2,a1-b3…

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