PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl:  <http://www.w3.org/2002/07/owl#> 

SELECT distinct ?p ?c1 ?c2
WHERE {
?c1 rdfs:subClassOf ?p.
?c2 rdfs:subClassOf ?p.
?c1 owl:disjointWith ?c2
FILTER (
!isBlank(?c1) &&
!isBlank(?c2) &&
!isBlank(?p)
)
}