iously that 
each way of distinguishing each group and ignoring other
differences implicitly defines a module?

&gt; | In the division of relations, etc., we do not,
&gt; | of course, disregard these differences, but we
&gt; | disregard some others.  There is nothing to prevent
&gt; | almost any sort of difference from being conventionally
&gt; | neglected in some discourse, and if 'I' be a term which
&gt; | in consequence of such neglect becomes indivisible in that
&gt; | discourse, we have in that discour