That takes me back to learning BASIC [beginners all purpose symbolic instruction code] on a Tandy TRS-80 microcomputer...
I've found that dial plan numbering can cover a huge range, so the trick is to have gaps built-in; the old BASIC code:
10 PRINT "HELLO WORLD"
20 GOTO 10
....
15 PRINT "- HAVE A GREAT DAY!"
New code:
10 ...
15 ...
20 ...
So, if you leave gaps, then you can always add entries between them.
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