What is the {Ritchey–Chrétien telescope} with the {MIN(observing time available)} whose {has part} is {Four Laser Guide Star Facility}  ?
At the Four Laser Guide Star Facility, which Ritchey-Chretien telescope has the lowest observing time available?
What is the Ritchey–Chrétien telescope with the lowest observing time available whose has part is Four Laser Guide Star Facility?
SELECT ?u WHERE { ?u rdf:type ontology:Ritchey–Chrétien_telescope . ?u property:has_part resource:Four_Laser_Guide_Star_Facility . ?u property:observing_time_available ?t }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1062138>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3891>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P527> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q24820708> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q1062138 . ?ent wdt:P3891 ?obj . ?ent wdt:P527 wd:Q24820708} ORDER BY ASC(?obj)LIMIT 5 
Very Large Telescope