Ow does each play reflect the rules of tragedy?

The paper must have all of the following:
A clear thesis statement that identifies a common theme in the literary works (Trifles by Susan Glaspell and Oedipus the King)
Clear reasons to back up the thesis statement
Textual evidence (Direct quotes from both the literary works that directly illustrate the reasons)
The paper may also include textual evidence from at least one secondary source (Biographies, Peer-Review articles, etc.) that directly illustrates the reason.

Must be at least 1000 words plus the Works Cited page.