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As for the Contractor 's reliance on a " prior course of dealing " between the parties as an interpretative device , the Government simply rejects the claim as irrelevant because the other GPO forms contracts used as supporting evidence have completely different terms from the disputed agreement . The electronic certification process provides positive identification of the Certifying Officer who authorizes the voucher , the source from which it originates , and ensures the authenticity of the transmitted data . Following the underdeterminacy thesis , the author also rejects the distinction between particularized and generalized implicatures , in favour of a continuum going from occasional context-dependent cases to those cases which are generally present in the vast majority of contexts and for which very specific contextual circumstances are required in order to be blocked . These are the measurable characteristics that might predict the risk of ADHD in the same way that serum cholesterol predicts the risk of heart disease . A characteristic of reptiles , Connors says , is that " they patrol their borders , and if an alien enters , lunge reflexively . This course surveys the movements , artists , and aesthetic theories that have informed art production in the United States and Europe from 1945 to the present day .