Heh, perhaps that's something else that was under-specified in my question. :) I understand the idea behind it - it's not a complex one - but my brain was just refusing to produce the code to match it. It was just a weird day when I was unable to focus (for Various But Definite Reasons); any programmer who's been around a while has seen this pattern many times.
I certainly appreciate the help you folks provided, though! 

-- 
I hate storms, but calms undermine my spirits.
 -- Bernard Moitessier, "The Long Way"

In reply to Re^2: Summing up duplicate lines by oko1
in thread Summing up duplicate lines by oko1

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