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the author is worried about negative impacts on the coral reef.
( z0 worry :ARG0 ( z1 person :ARG0-of ( z2 author ) ) :ARG1 ( z3 impact :ARG0-of ( z4 negative ) :ARG1 ( z5 reef :mod ( z6 coral ) ) ) )
(z0 / worry-02
    :ARG0 (z1 / person
              :ARG0-of (z2 / author-01))
    :ARG1 (z3 / impact-01
              :ARG0-of (z4 / negative-02)
              :ARG1 (z5 / reef
                        :mod (z6 / coral))))
the author is worried about negative impacts on the coral reef .
z1 :ARG0-of z2
z0 :ARG0 z1
z3 :ARG0-of z4
z0 :ARG1 z3
z5 :mod z6
z3 :ARG1 z5