order out of chaos in a pf

hi!

i'm sitting here thinking over
a problem i'd like to solve soon.

it concerns an interactive pgm.
that is meant to add a sequentially
assigned number (determined by the 
pgm) if the user chooses the add
add function.

now, i'll be using a pf that i've
already created. problem is that
whenever i create my pf's i 
randomly just type all sorts of
junk in there. so to begin with,
my pf does not have any sequential
numbers in it.

it may have for example,

1, 2, 222, 8000...

and since this is the case my
pgm. ought to "fill in the blanks"
so to speak, you know, and THEN assigning
numbers sequentially should the 
user choose the add function.

regards,

Mohammad



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