Question: Table entries with indices that have a certain pattern

I am trying to find the minimum values of a table, but not of all of its indices, just some that comply to a certain pattern.

The minimum of the values of a table are found by using min(entries(atable)).

If the indices of atable are "a1", "a2", "b1", "b2", I would like to just have the ones starting with "a".

Can be done by a loop, but is there a easier way?

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