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Note to galaxylogic: When lispm wrote:

     (defmethod foo ((p person) (s string))
                     (list p s))
He was implicitly defining a "generic function" "foo" of two arguments.

Defmethod was defining an implementation of the generic function foo for arguments person with string.

One could later put something like:

     (defmethod foo ((p person) (p person))
                     (send-greeting p p))
And thus define a "foo" that works on two persons, etc.

CLOS allows specializing not just on classes, but also on specific instances, so some method applies only for a specific instance. For example a "foo" that applies only to a particular "important" person.

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