Add CYCLING AND REMOVING SELECTIONS

runtime/tutor.txt

@@ -967,7 +967,29 @@ lines.
 
 
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-=                     10.1 CHANGING CASE                        =
+=              10.1 CYCLING AND REMOVING SELECIONS              =
+=================================================================
+
+ Type ) and ( to cycle the primary selection forward and backward
+ through selections respectively.
+
+ Type A-, to remove the primary selection.
+
+ 1. Move the cursor to the line below marked -->.
+ 2. Select both lines with xx or 2x.
+ 3. Type s to select, type "would" and enter.
+ 4. Use ( and ) to cycle the primary selection and remove the
+    very second "would" with A-, .
+ 5. Type c "wood" to change the remaining "would"s to "wood".
+
+ --> How much would would a wouldchuck chuck
+ --> if a wouldchuck could chuck would?
+
+ Note: A-( and A-) cycle the *contents* of the selections
+       as well as the position of the primary selection.
+
+=================================================================
+=                     10.3 CHANGING CASE                        =
 =================================================================
 
  Type ~ to switch the case of all selected letters.