[ Doubt] PC-1500A

[hp41cx]

10 DIM A$(9)*2
20 DIM B$(9)*2
30 GOTO 20

How do I avoid making a mistake on line 20.
Preferably without using on error.

[charognard]

10 DIM A$(9)*2
20 DIM B$(9)*2
30 GOTO 20

Error 5 : Variable already exist

REDIM command not exist on PC1500

[hp41cx]

10 DIM A$(9)*2
20 DIM B$(9)*2
30 GOTO 20

Error 5 : Variable already exist

REDIM command not exist on PC1500

And would you have a solution to this error?

[charognard]

Command ERASE HERE


Monitor hexa-decimal HERE for write it.

[pir2]

Or CLEAR, but this will delete all the variables, including the A$ array