Change takeOrder grammar to only accept one drink

psGrammar/challenge/nea/takeOrder.jsgf

@@ -3,11 +3,7 @@ grammar nea;
 
 public <nea> = [tobi|tiago] ( <pre>  <ord> );
 
-<pre> = (i want | i would like to have);
-<ord> = (<order> | <order> <addOrder>);
-<order> = (<drink> | <number> <drink>);
-<addOrder> = (<and> <order>);
+<pre> = (i want [a]| i would like to have [a] | bring me);
+<ord> = <drink>;
 
 <drink> = (coke|malz|lemonade|water|ice tea|coffee);
-<number> = (one|two|three|four|five|six|seven|eight|nine);
-<and> = (and);