What are the three layers of data warehouse architecture?

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1. #following
2. #sources
3. #external
4. #system
5. #consultants
6. #other
7. #bottom
8. #which
9. #database
10. #relational
11. #architecture
12. #customers
13. #provided
14. #layers
15. #warehouse
16. #extracted
17. #three
18. #databases
19. #information
20. #operational