anchor.diff:  
   * p. 274, _Utilities_, The implementation of +.util.pivot+ should read:
   +
  +[source, q]
   ----
   pivot:{[t]
    u:`$string asc distinct last f:flip key t;
  
positive.code: * p. 209, *15.1 Partitioning By Column*, _The +sym+ File_, The second
    listing should begin with the following command:
  +
  ----
  q)prices`id
  ----
  
negative.code: * p. 119, *9.3 Trades*, _Grouping_, The second listing should not have
    the extra:
  +
  [source, q]
  ----
  q)o
  ----
  