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More troff bits; if you want them elsewhere, feel free to repo copy them.
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 1 aa83d772 2004-05-17 devnull awk ' # range.prep

 2 aa83d772 2004-05-17 devnull #   Input:  ["%begin"|"%end"|""] string (tab) number

 3 aa83d772 2004-05-17 devnull #   Output: string (tab) ["b"|"e"|"a"]  (tab) number

 4 aa83d772 2004-05-17 devnull 

 5 aa83d772 2004-05-17 devnull BEGIN		{ FS = OFS = "\t" }

 6 aa83d772 2004-05-17 devnull 		{ f2 = "a" }

 7 aa83d772 2004-05-17 devnull $1 ~ /^%begin/	{ f2 = "b"; sub(/^%begin */, "", $1) }

 8 aa83d772 2004-05-17 devnull $1 ~ /^%end/	{ f2 = "e"; sub(/^%end */, "", $1) }

 9 aa83d772 2004-05-17 devnull 		{ print $1, f2, $2 }

10 aa83d772 2004-05-17 devnull ' $*