anchor.diff:  
   product([], Acc) ->
       Acc;
  -product([L | Rest], Acc) ->
  -    product(Rest, [[H | T] || H <- L, T <- Acc]).
  +product([L|Rest], Acc) ->
  +    product(Rest, [[H|T] || H <- L, T <- Acc]).
   
   %%----------------------------------------------------------------------------
   %% PropErties
  
positive.code: 
  scan(<<C/utf8, Rest/bytes>>) ->
      case C of
          $( -> [{'(', 1} | scan(Rest)];
          $) -> [{')', 1} | scan(Rest)];
          $& -> [{'&', 1} | scan(Rest)];
          $| -> [{'|', 1} | scan(Rest)];
          $! -> [{'!', 1} | scan(Rest)];
          32 -> scan(Rest); % skip spaces
          _  ->
              Regex = [<<"^([^()&|! ]*)(.*)$">>],
  
negative.code: tree_to_query({not_q, SubTree}, Lang) ->
      #not_q{sub = tree_to_query(SubTree, Lang)};
  tree_to_query({term_q, {string, Keyword, _}}, Lang) ->
      [Term|_] = dk_pp:terms(Keyword, Lang),
      #term_q{term = Term}.
  
  mv_not_in(#and_q{subs = Qs}) ->
  