diff -r 14c3dd5ee2ad -r 7b8c4fe235aa CookBook/Solutions.thy
--- a/CookBook/Solutions.thy	Wed Jan 14 21:46:04 2009 +0000
+++ b/CookBook/Solutions.thy	Wed Jan 14 23:44:14 2009 +0000
@@ -41,9 +41,9 @@
   @{ML scan_all} retruns a string, instead of the pair a parser would
   normally return. For example:
 
-  @{ML_response [display] "scan_all (explode \"foo bar\")" "\"foo bar\""}
+  @{ML_response [display,gray] "scan_all (explode \"foo bar\")" "\"foo bar\""}
 
-  @{ML_response [display] "scan_all (explode \"foo (*test*) bar (*test*)\")" 
+  @{ML_response [display,gray] "scan_all (explode \"foo (*test*) bar (*test*)\")" 
                           "\"foo (**test**) bar (**test**)\""}
 
 *}