Question: What are the clade which start with the letter x
Paraphrase: What is the class starting with the letter x?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q713623 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'x')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Xenopodinomorpha, Xenopodinomorpha