Set category to unknown for exercises without category.

[text-smell-og-bang-hauge.git] / exercise / formalin-klokke.tex

diff --git a/exercise/formalin-klokke.tex b/exercise/formalin-klokke.tex
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+++ b/exercise/formalin-klokke.tex
@@ -1,3 +1,4 @@
+% category: unknown
 \section{Formalin klokke}
 \label{formalinklokke} \index{Formalin klokke|textbf}
 (Reduksjon av formalin med hydrogensulfitt)