How many {phase point} are to/by {critical point} ?
What is the critical point's phase point?
What's the phase point of the critical point?
SELECT ( COUNT ( ?x ) AS ?t ) { ?x property:phase_point resource:critical_point }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P873> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q111059 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P873 wd:Q111059 }
23