How to handle a multi-level variable

I'm using a variable to hold multiple lines of a file. I append lines
to the variable, and then use lineget to use the ones I need. What I
need to do is re-initialize all levels of the variable before the next
iteration of the loop it is in to avoid duplicate values. I've looked
in the manuals, and it seems that I need to do a #FRAME then push that
one variable, use it, then do an #UNFRAME before starting the next
iteration of the loop. Can anyone tell me if I've got this right, or
is there a better way to do it?
Thanks!

.

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