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More troff bits; if you want them elsewhere, feel free to repo copy them.
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1 awk ' # range.prep

2 #   Input:  ["%begin"|"%end"|""] string (tab) number

3 #   Output: string (tab) ["b"|"e"|"a"]  (tab) number

5 BEGIN		{ FS = OFS = "\t" }

6 		{ f2 = "a" }

7 $1 ~ /^%begin/	{ f2 = "b"; sub(/^%begin */, "", $1) }

8 $1 ~ /^%end/	{ f2 = "e"; sub(/^%end */, "", $1) }

9 		{ print $1, f2, $2 }

10 ' $*