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Prior to this document, none of the signatures would have been valid.
( z0 valid :ARG1 ( z1 sign :quant ( z2 none ) ) :time ( z3 prior :op ( z4 document :mod ( z5 this ) ) ) )
(z0 / valid-02
    :ARG1 (z1 / sign-01
              :quant (z2 / none))
    :time (z3 / prior
              :op1 (z4 / document
                       :mod (z5 / this))))
Prior to this document , none of the signatures would have been valid .
z4 :mod z5
z3 :op1 z4
z1 :quant z2
z0 :ARG1 z1
z0 :time z3