I'm pretty good at regexes, but programming in sed is where I break down. 
How does one convert this:
A1
B1
A2
B2
A3
B3
...
into this:
A1 B1
A2 B2
A3 B3
...
?  I tried "sed -n -e :begin -e H -e H -e p" but apparently the "pattern 
space" referred to in the man page includes the LF.  The goal is not only to 
get it done right, but to get it done _fast_.
-- 
-eben    QebWenE01R@vTerYizUonI.nOetP    royalty.mine.nu:81
Answer: two spoonfuls in my cup, please.
Question: how much should I use?      (why top-posting is bad)
     http://www.fscked.co.uk/writing/top-posting-cuss.html
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