query: #title: Single value per language
  # Complex constraint from [[Property talk:P3321]]
  # An item would generally have P2521 statement per language. TODO: define exceptions
  SELECT ?item ?lang (COUNT(?monolingualstring) as ?count)  (GROUP_CONCAT(?monolingualstring; separator=" // ") as ?list)
  { 
  	?item wdt:P3321 ?monolingualstring . 
  	BIND(lang(?monolingualstring) as ?lang)
  	FILTER ( ?item not in ( wd:Q4115189,wd:Q13406268,wd:Q15397819,wd:Q957729,wd:Q11631,wd:Q2259532,wd:Q33999,wd:Q30185 ) )
  } 
  GROUP BY  ?item ?lang
  HAVING (?count > 1)
  ORDER BY DESC(?count)
  LIMIT 100