Tell me the folk religion that has as foundational text Nihon Shoki and starts with the letter s?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q1068640 . ?sbj wdt:P457 wd:Q813935 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 's')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
folk religion: Q1068640 nihon shoki: Q813935