But the picture is actually even more complicated, through the integral notion of 'relative motivation'. Relative motivation refers to the compositionality of the linguistic system, along the lines of an immediate constituent analysis. This is to say that, at the level of "langue", hierarchically nested signifiers have relatively determined signified. An obvious example is in the English number system: That is, though "twenty" and "two" might be arbitrary representations of a numerical concept, "twenty-two", "twenty-three" etc. are constrained by those more arbitrary meanings. The tense of verbs provides another obvious example: The meaning of "kicked" is relatively motivated by the meanings of "kick-" and "-ed". But, most simply, this captures the insight that the value of a syntagm—a system-level sentence—is a function of the value of the signs occurring in it. It is for this reason that Leonard Bloomfield called the lexicon the set of fundamental irregularities of the language. (Note how much of the "meaningfulness" of the "Jabberwocky" poem is due to these sorts of compositional relationships!)