Structures

I've been trying to learn Lisp for a few weeks now. I've read most of
Practical Common Lisp, and noticed that there is no mention of
structures or defstruct. I did not read the sections on CLOS, so I am
assuming that objects can probably achieve all that structures did,
but it seems that a lot of legacy code, and code that I am writing for
my Artificial Intelligence class will use structures.

Is it still common to use structures in common lisp code? Is there any
reason I should avoid them? It seems that some of the newer guides do
not mention them. Thanks!
.

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