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This is all a matter of definition.
( z0 matter :domain ( z1 this :mod ( z2 all ) ) :topic ( z3 define ) )
(z0 / matter
    :domain (z1 / this
                :mod (z2 / all))
    :topic (z3 / define-01))
This is all a matter of definition .
z1 :mod z2
z0 :domain z1
z0 :topic z3