anchor.diff:      
       ;B =:= date
       ;B =:= demonitor
  -    ;B =:= erase
       ;B =:= exit
       ;B =:= get_stacktrace
       ;B =:= group_leader
  
positive.code:     ;B =:= now
      ;B =:= process_flag
      ;B =:= processes
      ;B =:= put
      ;B =:= send_after
      ;B =:= spawn
      ;B =:= spawn_link
  
negative.code:     ;A =:= now
      ;A =:= process_flag     %% Depends only with delivery of a signal
      ;A =:= processes        %% Depends only with spawn and exit
      ;A =:= send_after
      ;A =:= spawn            %% Depends only with processes/0
      ;A =:= spawn_link       %% Depends only with processes/0
  