4-level stack manipulation on 12c

[Dale Reed]

I'm sure someone will find an 'elegant' way in fewer steps, but:

---
---
17
5 Enter ^

---
17
5
5 Enter ^

17
5
5
5 R v

5
17
5
5 R v

5
5
17
5 R v

5
5
5
17 Enter ^

5
5
17
17 R v

17
5
5
17 x <> y

17
5
17
5 Task complete

Total 8 operations.
Yep, somebody will definitely find a shorter one. But at least this is straightforward. ;-)

Dale