  Other accounts of category mistakes have implications for different foundational issues. For example, we have seen that the truthvaluelessness view is committed to the existence of truth-valueless propositions, which in turn conflicts with the Tarskian truth-schema. For another example, consider the presuppositional account of category mistakes (on any of its versions). If the presuppositional account is correct, then the set of presupposition triggers is much wider than has previously been assumed: presupposition triggers are not restricted to a small number of special words like ‘know’ or ‘the’, but rather encompass at least most adverbs and adjectives in natural language. This in turn has a variety of implications for the triggering problem: the question of why particular lexical items trigger their respective presuppositions, and the issue of whether this question can be answered based on general pragmatic principles, or rather by maintaining that presupposition triggers are  simply a conventionally encoded aspect of  language.[32]