Question: How many programs were done under the class of General Government in the expenditure of the Town of Cary?
SPARQL:
 select count(distinct(?program)) as ?result from <http://linkedspending.aksw.org/town_of_cary_expenditures> { ?obs qb:dataSet ls:town_of_cary_expenditures. ?obs lso:town_of_cary_expenditures-Program ?program. ?obs lso:town_of_cary_expenditures-Class <https://openspending.org/town_of_cary_expenditures/Class/3>. }