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The query
PREFIX c4dt: <https://w3id.org/rete/c4dt#>
PREFIX schema: <http://schema.org/>
SELECT ?lab ?code ?prof (COUNT(DISTINCT ?p) AS ?projects) (COUNT(DISTINCT ?repo) AS ?repos) WHERE {
?l a c4dt:Lab ; schema:name ?lab ; c4dt:labIdentifier ?code ;
c4dt:headOfLab ?person .
?person schema:name ?prof .
?p c4dt:developedBy ?l .
OPTIONAL { ?p schema:codeRepository ?repo }
} GROUP BY ?lab ?code ?prof ORDER BY DESC(?projects)