A periodical index<span> contains citations for articles in magazines, journals, and newspapers which can be retrieved through searching. Some </span>periodical indexes<span>also include abstracts (brief summaries) of the articles and sometimes even the full text or entire content of articles as they originally appeared. You're welcome ;)</span>
The present and the past are similarly related by the fact that you know what happened. For example you know what’s going to happen to you right now? You mostly do. Do you know what happened in the past? Yes.
Repetition is a rhetorical device so I believe it is that.
