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The irs is concerned about the blockading.
( z0 concern :ARG0 ( z1 blockade ) :ARG1 ( z2 government-organization :name ( z3 name :op "IRS" ) ) )
(z0 / concern-01
    :ARG0 (z1 / blockade-01)
    :ARG1 (z2 / government-organization
              :name (z3 / name
                        :op1 "IRS")))
The irs is concerned about the blockading .
z2 :name z3
z3 :op1 0
z0 :ARG1 z2
z0 :ARG0 z1