> @Andrew:
> I guess it would be quite easy to create a max_symbolic{} and
> min_symbolic{} function. I have been missing these several times. An
> iterated concatenate{} function would also make sense.
>
Why not to use numbers like 201, 203, ... rather than symbols "Pool201",
"Pool203", ... to identify pools? If necessary, symbols can be built
from numbers by concatenation "Pool" & pool, or numbers can be extracted
from symbols, e.g. with substr(pool, 5, 3).
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