Question: Tell me the archaeological artifact that was discovered by Pierre-François Bouchard and starts with the letter r?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q220659 . ?sbj wdt:P61 wd:Q1386062 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25