Put the following events from “the fall of the house of usher” into order in which they occur

1. Usher invites the narrator for a visit.

2. The narrator encounters the Usher family physician.

3. Usher explains that his sister is dying.

4. Usher and the narrator spend their days reading.

5. Usher and the narrator take the coffin to the vault.

6. Both Usher and the narrator have difficulty sleeping.

7. The house of Usher is destroyed.

there is no passage.