Rob van der Heij wrote:
> When you name the fields, you can see both at the same time

Right, but I can't tell a missing field from an empty reading station
when I go to compare them.  I guess what I was imagining was a SELECT
BOTH that would allow any items other than input field specifications to
be processed only when there were records at both stations.

>         'if first()||eof() then noprint',

AHA!  I looked for TOF() by analogy with EOF() and somehow didn't manage
to find FIRST() even though I thought I'd looked for "run-in."  That's
exactly what I needed:

    if b>=a&¬first() then write

¬R

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