sub_atom implementation

Hi All!
I am using SWI Prolog. I have two issues regarding sub_atom/5 predicate.

First, is it convenient to use it or it is better to use difference list (in
terms of speed).
Does it depends on the implementation I use?

Second, as a declarative language Prolog allow to "say what you want" and
not "how".
Is it possible to say sub_atom/5 that I want first longer sub atoms without
tailoring a new predicate?

Thanks in advance.

M


.

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