14. A method as recited in claim 13 , wherein the first type of grammar is a command grammar and the second type of grammar is a collection grammar.
14. A method as recited in claim 13 , wherein the first type of grammar is a command grammar and the second type of grammar is a collection grammar. 15. A method as recited in claim 14 , wherein said filtering comprises at least one operation from the set of operations consisting of: balancing, using said processor, between the second output sets according to a size of the corpus of the corresponding speech applications; filtering, using said processor, the second output sets to remove expressions that are not present in the corpus of at least a predetermined subset of the plurality of speech applications; assigning, using said processor, weights to tokens in the second output sets.