HP 15c Collector's Edition Owner's Handbook Manual page 95

Section 7: Program Editing 83
The Back Step Instruction.
backwards
‚
back step
‚
‚
not
Deleting Program Lines
− back arrow in
Program mode
−
−
Inserting Program Lines
preceding
following
Examples
Deletions:
Changes:
h
¦ l 1
h
O 4
O 2 l 4 l 2