Question: How many operating systems, contain the software whose Stack Exchange tag is https://reverseengineering.stackexchange.com/tags/windows ?
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "operating system" . ?e_1 <part_of_the_series> ?e . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "software" . ?e_1 <Stack_Exchange_tag> ?pv . ?pv <pred:value> "https://reverseengineering.stackexchange.com/tags/windows" .   }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Stack Exchange tag
https://reverseengineering.stackexchange.com/tags/windows
function: FilterConcept
dependencies: 1
inputs: software
function: Relate
dependencies: 2
inputs: part of the series
forward
function: FilterConcept
dependencies: 3
inputs: operating system
function: Count
dependencies: 4
Answer: 0