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those individual objects might change their qualities without
losing their individual identity; so that
limiting ourselves to any instant
any individual object which at that instant forms
a part of the sam forever forms a part of
an object of which no object not at that
instant a part of the sam is a part, and this
individual composite whole which has
nothing to do with the qualities of its members
is a gath.

For every gath there must be a corresponding
sam. This is what we should ordinarily
express by saying that whatever exists is
possible. Or, as De Morgan put it,
the individuals of whatsoever collection have some