4-level stack manipulation on 12c

[RayAtHP]

(03-02-2015 10:48 AM)PANAMATIK Wrote:  

(03-02-2015 08:19 AM)Csaba Tizedes Wrote:  But it does not count (...too many preconditions).

If preconditions are allowed:

RCL 0 (R0 contains 17)
RCL 1 (R1 contains 5)

Shortest key sequence with preconditions allowed:

R/S

Stretching the preconditions a bith further and assuming 17 and 5 are on the stack:

2dup

... hp71b in forth mode.