Question: Tell me the number of mathematics that is the work area of David Hilbert an is practiced by statistician
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "mathematics" . ?e_1 <field_of_work> ?e . ?e_1 <pred:name> "David Hilbert" .  ?e <practiced_by> ?e_2 . ?e_2 <pred:name> "statistician" .  }
Program:
function: Find
inputs: David Hilbert
function: Relate
dependencies: 0
inputs: field of work
forward
function: FilterConcept
dependencies: 1
inputs: mathematics
function: Find
inputs: statistician
function: Relate
dependencies: 3
inputs: practiced by
backward
function: FilterConcept
dependencies: 4
inputs: mathematics
function: And
dependencies: 2
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function: Count
dependencies: 6
Answer: 0