-model. When you select a chain in the list, edges of the chain are
-shown in the Viewer with arrows so that you can chose a common
-direction for all chain edges. \b Reverse button inverses the common
-direction of chain edges. If \b Add button is active, this means that some
-edges of a chain have different direction and you can click \b Add
-button to add such edges to <b>Reversed Edges</b> list.
+model. When a chain is selected in the list its edges are
+shown in the Viewer with arrows, which enables choosing a common
+direction for all chain edges. \b Reverse button inverts the common
+direction of chain edges. If \b Add button is active, some
+edges of a chain have a different direction, so you can click \b Add
+button to add them to <b>Reversed Edges</b> list.