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I agree with Jon on the following point:

&gt;Maybe I need to say that I mean "eliminating variables"
&gt;in the sense of "explaining them away", in other words,
&gt;more like "taking them off the list of basic concepts".

As I pointed out in several notes, we have to make a distinction
between the concepts that describe the domain of discourse (i.e.
the real world or some aspect of it that the SUO is trying to
address) and the concepts that are used to describe the