anchor.diff:  * p. 119, *9.3 Trades*, _Grouping_, The second listing should not have
     the extra:
   +
  +[source, q]
   ----
   q)o
   ----
  
positive.code: * p. 184, *14.2 Pivot Tables*, _Writing a Pivot Function_, The
    implementation of +.util.pivot+ should read:
  +
  ----
  pivot:{[t]
   u:`$string asc distinct last f:flip key t;
  
negative.code: 
  * p. 274, _Utilities_, The implementation of +.util.pivot+ should read:
  +
  [source, q]
  ----
  pivot:{[t]
   u:`$string asc distinct last f:flip key t;
  