Give me {ring system} that starts with {'r'}
Name the ring systems that begin with alphabet R.
What are the ring system  which start with the letter r
SELECT DISTINCT ?d WHERE { ?d rdf:type ontology:ring_system . FILTER ( STRSTARTS ( LCASE ( ?d ) , 'r' ) ) }
SELECT DISTINCT ?sbj ?sbj_label { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sbj . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q28951811>. ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q28951811 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
rings of Uranus rings of Uranus Rings of Rhea Rings of Rhea Rings of Earth Rings of Earth Rings of Pluto Rings of Pluto rings of Jupiter rings of Jupiter Rings of Saturn rings of Saturn rings of Neptune rings of Neptune