premise: The answer has nothing to do with their cause , however , but with the simple fact that dictionaries are not exercises in bi-unique substitutability ; in other words , if one of the senses of run is `operate ' ( as in She runs an engine factory ) , that does not make it valid to assume that one can substitute operate for run in We run in the marathon every year . Although recognizing this as a shortcoming of dictionaries and assigning it arbitrarily to what , for lack of a better term , we might call the genius of the language , might seem trivial to the casual observer , it is a valid matter for concern in the realm of lexicology . 
hypothesis: The answer given is irrelevant to their cause .