query: SELECT DISTINCT classroom ,  grade FROM list
question: For each classroom reports that grade where is taught it in the thing. Report just that classroom number and that grade number.
query_toks: SELECT DISTINCT classroom , grade FROM list
query_toks_no_value: select distinct classroom , grade from list
question_toks: For each classroom reports that grade where is taught it in the thing. Report just that classroom number and that grade number.