Question: How many chemical elements were discovered at the sovereign state whose demonym is britannica ?
Choices:
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Answer: 2
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "chemical element" . ?e <location_of_discovery> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "sovereign state" . ?e_1 <demonym> ?pv . ?pv <pred:value> "britannica" .   }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: demonym
britannica
function: FilterConcept
dependencies: 1
inputs: sovereign state
function: Relate
dependencies: 2
inputs: location of discovery
backward
function: FilterConcept
dependencies: 3
inputs: chemical element
function: Count
dependencies: 4