We have 12 Activity types . from these what types can be used in flows?

We have 12 activity types :
1. Activity  - cannot be used in the flow
2. Assign
3. Connect
4. Locate  - cannot be used in the flow
5. Notify
6. OnChange - cannot be used in the flow
7. Route
8. Validate
9. Trigger - cannot be used in the flow
10. Utility
11. Assembler
12. LoadDeclarativePage - cannot be used in the flow