The E and L components can be used to explain the syntactic structures that make up sentences in human languages. The first component, the L component, contains content words. This component is responsible for carrying the lexical information that relays the underlying meaning behind a sentence. However, combinations consisting solely of L component content words do not result in grammatical sentences. This issue is resolved through the interaction of the L component with the E component. The E component is made up of : words that are responsible for inserting syntactic information about the syntactic categories of L component words, as well as morphosyntactic information about clause-typing, question, number, case and focus. Since these added elements complement the content words in the L component, the E component can be thought of as being applied to the L component. Considering that the L component is solely composed of lexical information and the E component is solely composed of syntactic information, they do exist as two independent systems. However, for the rise of such a complex system as human language, the two systems are necessarily reliant on each other. This aligns with Chomsky's proposal of duality of semantics which suggests that human language is composed of these two distinct components. In this way, it is logical as to why the convergence of these two components was necessary in order to enable the functionality of human language as we know it today.