Is there a specific plot to the Slasher film?

Attempts have been made to define the sub-genre by its often formulaic plot structure. It has been said that slasher films loosely adhere to the following formula:

Past Event

1. The young community is guilty of a wrongful action.
2. The killer sees an injury, fault or death.
3. The killer experiences a loss.
4. The killer kills the guilty members of the young community

Present Events

1. An event commemorates the past action.
2. The killer's destructive force is reactivated.
3. The killer re identifies the guilty parties.
4. A member of the old community warns the young community (optional).
5. The young community takes no heed.
6. The killer stalks members of the young community.
7. A member of some type of force like a detective ect. hunts down the killer like in Halloween (1978 and 2007) we have Dr. Sam Loomis in Prom Night (2007) we have detective Winn.
8. The killer kills members of the young community.
9. The heroine sees the extent of the murders.
10. The heroine sees the killer.
11. The heroine does battle with the killer.
12. The Heroine kills or subdues the killer.
13. The heroine survives.
14. But the heroine is not free.