query: # Title: Search lexeme using wikibase:lemma 
  # What is lexeme (Q111352) and lemma (Q18514)?
  SELECT ?lexeme ?lemma ?langLabel ?lang WHERE {
   ?lexeme wikibase:lemma ?lemma.
   ?lexeme <http://purl.org/dc/terms/language> ?lang.
   SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
   FILTER(REGEX(?lemma, "^Prague")) # ^ lemma starts with string
  }
  LIMIT 20