anchor.diff:  
   noCmd(Eed, Range, false) ->
     incLine(Eed, Range, false);
  -noCmd(Eed, Range, RangeGiven) ->
  -  print(Eed, Range, RangeGiven).
  +noCmd(Eed, Range, true) ->
  +  print(Eed, Range, true).
   
   quit(_Eed, _Range, false) ->
     {quit, ""};
  
positive.code: print(Eed, {A, E}, _RangeGiven) ->
    AValid = linenumValid(Eed, A),
    EValid = linenumValid(Eed, E),
    if AValid, EValid, A =< E -> print(Eed, A, E, validated);
       true -> {error, unknown()}
    end.
  
  
negative.code: delete(Eed, {A, E}, _RangeGiven) ->
    AValid = linenumValid(Eed, A),
    EValid = linenumValid(Eed, E),
    if AValid, EValid, A =< E ->
         delete(Eed, A, E, validated);
       true -> {error, unknown()}
    end.
  delete(Eed, A, A, validated) -> 
  