Upon selecting option "Find excerpts containing query words"
You get a report containing excerpts (paragraphs) with a query words.

Upon selecting option "Retrieve excerpts related to the query's subject"
You get excerpts containing your query words so as additionally suggested words related to a query subject.

Upon selecting option "Arrange excerpts evolving query's content"
You get a quasi coherent ("author text"-like) output material, in which
each paragraph is related to the precedent ones and evolves their content.
