query: SELECT ?item ?inv WHERE {
  	?item  wdt:P31 wd:Q21199 .
  	?item  wdt:P1181 ?value .
  	filter (?value >= 1 && ?value <= 5500) .
  	bind(concat("NG", str(?value)) as ?inv)
  
  	filter not exists {
  		?painting wdt:P217 ?inv .
  #		?painting wdt:P195 wd:Q180788 .
  #		?painting wdt:P31 wd:Q3305213 .
  	}
  } ORDER BY ?value
  LIMIT 2000