query: #title: basic patterns without an item
  # Complex constraint from [[Property talk:P1030]]
  # create an item for the light characteristic. Ensure patterns are normalized before creating items for them.
  SELECT (SAMPLE(?item) as ?item) ?value (COUNT(DISTINCT ?item) as ?count)
  { 
    ?item wdt:P1030 ?value . 
    FILTER NOT EXISTS { ?pattern wdt:P1030 ?value ; wdt:P31 wd:Q1738955 } . 
    FILTER(REGEX(?value, "^(Iso\u007CFl\u007COc\u007CQ\u007CLFl\u007CVQ)(\\(\\d\\))? [WRGY]{1,4} [\\d\\.]+s$"))
    FILTER(!REGEX(?value, "FI"))   
  }
  GROUP BY ?value 
  ORDER BY DESC(?count)
  LIMIT 20