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This is about a study on cigarettes.
( z0 study :ARG1 ( z1 cigarette ) :topic-of ( z2 this ) )
(z0 / study-01
    :ARG1 (z1 / cigarette)
    :topic-of (z2 / this))
This is about a study on cigarettes .
z0 :topic-of z2
z0 :ARG1 z1