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A study done in the 80s predicted a gap of 0.6 percent.
( z0 predict :ARG0 ( z1 study :time ( z2 date-entity :decade 80 ) ) :ARG1 ( z3 gap :mod ( z4 percentage-entity :value 0.6 ) ) )
(z0 / predict-01
    :ARG0 (z1 / study-01
              :time (z2 / date-entity
                        :decade 80))
    :ARG1 (z3 / gap
              :mod (z4 / percentage-entity
                       :value 0.6)))
A study done in the 80s predicted a gap of 0.6 percent .
z1 :time z2
z2 :decade 1
z0 :ARG0 z1
z0 :ARG1 z3
z4 :value 0
z3 :mod z4