The assignment of the top row keys is a follows:

- A: Add to sum
- B: Display sum
- C: Clear sum

01 LBL "SUM"
02 LBL "A" ; Add to sum
03 STO + 00
04 RTN
05 LBL "B" ; Recall current sum
06 RCL 00
07 RTN
08 LBL "C" ; Clear sum
09 0
10 STO 00
11 RTN |

Enter "CATALOG 1" to verify that the program "SUM" has been deleted.

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