What's the meaning behind the song Stairway to Heaven?

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Tags

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2. #turns
3. #heaven
4. #beginning
5. #meaning
6. #wrote
7. #questions
8. #about
9. #robert
10. #plant
11. #money
12. #spent
13. #pretty
14. #woman
15. #lyrics
16. #stairway
17. #accumulates