NE' means (1)
that which is one by accident, (2) that which is one by its own
nature. (1) Instances of the accidentally one are 'Coriscus and what
is musical', and 'musical Coriscus' (for it is the same thing to say
'Coriscus and what is musical', and 'musical Coriscus'), and 'what
is musical and what is just', and 'musical Coriscus and just
Coriscus'. For all of these are called one by virtue of an accident,
'what is just and what is musical' because they are accidents of one
substance, 'what is musical and Coriscus' because the one is an
accident of the other; and similarly in a sense 'musical Coriscus'
is one with 'Coriscus' because one of the parts of the phrase is an
accident of the other, i.e. 'musical' is an accident of Coriscus;
and 'musical Coriscus' is one with 'just Coriscus' because one part
of each is an accident of one and the same subject.