Question: How many narratives are there for Cheshire West and Chester council spending in the category of Marketing?
SPARQL:
 select count(distinct(?narrative)) as ?result from <http://linkedspending.aksw.org/cheshire_west_and_chester_april_2013> { ?obs qb:dataSet ls:cheshire_west_and_chester_april_2013. ?obs lso:cheshire_west_and_chester_april_2013-narrative ?narrative. ?obs lso:cheshire_west_and_chester_april_2013-expenditure-category "Marketing". }