  As applied to category mistakes, the former approach yields either a version of the contentlessness view or of the truthvaluelessness view—depending on whether one takes presuppositional failure to lead to a failure to express content or merely a failure to have a truth-value. (From now on we will assume that this presuppositional account is understood as a version of the truthvaluelessness view.) An important advantage of this version of the truth-valueless approach over the ones discussed previously is that it seems to correctly account for the behavior of category mistakes embedded in complex sentences. However, note that the view still predicts that contentful sentences can lack truth-value, and more specifically that contentful instances of logical tautologies (e.g. ‘It’s not the case that two is green and two isn’t green’) can fail to be true.