Question: How many operating systems were followed by the proprietary software that was followed by Windows 7?
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "operating system" . ?e <followed_by> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "proprietary software" . ?e_2 <follows> ?e_1 . ?e_2 <pred:name> "Windows 7" .   }
Program:
function: Find
inputs: Windows 7
function: Relate
dependencies: 0
inputs: follows
forward
function: FilterConcept
dependencies: 1
inputs: proprietary software
function: Relate
dependencies: 2
inputs: followed by
backward
function: FilterConcept
dependencies: 3
inputs: operating system
function: Count
dependencies: 4
Answer: 1