anchor.diff:  	].
   
   smoke_test() ->
  -    ok = application:start(alphadiamond).
  +    ok = application:start(alphadiamond),
  +    diamond("Z").
   
   -endif.
positive.code: 	CleanSpec = re:replace(TrimmedSpec, "[^A-Za-z]", "", [global, {return,list}]),
  	% io:format("~p ~p", [CleanSpec, TrimmedSpec]),
  	(CleanSpec =:= TrimmedSpec) and (length(CleanSpec) == 1).
  
  -ifdef(TEST).
  
  
negative.code: 	"[^" ++ Letter ++ "]".
  
  row_for(Letter) ->
  	io:format("Letter: ~p\n", [Letter]),
  	re:replace(?ROW_TEMPLATE, everything_but(Letter), " ", [global, {return,list}]).
  
  is_valid_spec(Spec) -> 
  