\n Extrusion is used to build mesh elements of plus one
dimension than the input ones. Any node, segment or 2D element can be
-extruded. Element of each type extrude into elements of a certain type
-as follows:
+extruded. Each type of elements has a corresponding type of extruded elements:
<table>
<tr><td><b>Extruded element</b></td><td><b> Result elements </b></td></tr>
<tr><td>Node </td><td> Segments </td></tr>
<li>specify the distance of extrusion along the vector.</li>
</ul>
<li>Specify the number of steps.</li>
- <li>If you activate <b>Generate Groups</b> check-box then the created
+ <li>If you activate <b>Generate Groups</b> check-box, the created
elements contained in groups will be included into new groups named
by pattern "<old group name>_extruded". </li>
</ul>
