Index: trunk/doc/user/09_appendix/layer_colors.html
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 <h2> 9.4 Layer colors</h2>
 <p>
 Each layer has its own layer color. Starting with lihata board v5, the
-layer color is saved to and loaded from board files. Layers retrain their
+layer color is saved to and loaded from board files. Layers retain their
 color even when they are moved within or between layer groups.
 <p>
 In parallel to this mechanism, there is a set of <i>default</i> colors