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Slate is an open source of information.
( z0 source :ARG0 ( z1 publication :name ( z2 name :op "Slate" ) ) :ARG1 ( z3 information ) :ARG1-of ( z4 open ) )
(z0 / source-02
    :ARG0 (z1 / publication
              :name (z2 / name
                        :op1 "Slate"))
    :ARG1 (z3 / information)
    :ARG1-of (z4 / open-04))
Slate is an open source of information .
z1 :name z2
z2 :op1 0
z0 :ARG1-of z4
z0 :ARG0 z1
z0 :ARG1 z3