|quote=The second form ... is a circular argument, because the conclusion is already stated in premises.}}</ref> If a scientist made biased a priori assumptions, there is little point in asking what conclusions he derived.<ref name="DeniableDarwin">{{cite book
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|quote=The second form ... is a circular argument, because the conclusion is already stated in premises.}}</ref> If scientists had made biased a priori assumptions, there is little point in asking what conclusions they have derived.<ref name="DeniableDarwin">{{cite book