A language can be thought of as a number of strings or sequences of symbols. The definition of a language defines which strings belong to the language but, since most languages of interest consist of an infinite number of strings, this definition is impossible to accomplish by listing the strings (or sentences). While the number of sentences in a language can be infinite, the rules by which they are constructed are not. This may explain why we are able to speak sentences in a language that we have never spoken before, and to understand sentences that we have never heard before.From the information provided above, it can be validly concluded that

Directions: For each question, a paragraph will be given that contains all the information necessary to infer the correct answer. Use only the information provided in the paragraph. Do not speculate or make assumptions that go beyond this information. Also, assume that all information given in the paragraph is true, even if it conflicts with some fact known to you. Only one correct answer can be validly inferred from the information contained in the paragraph.