query: #title: Unsuitable IMDb identifier for human
  # Complex constraint from [[Property talk:P345]]
  # Person with IMDb identifier but prefix is not ''nm'' or ''ch''
  SELECT DISTINCT ?item WHERE { ?item wdt:P31 wd:Q5; wdt:P345 ?imdb . FILTER(!STRSTARTS(?imdb, 'nm') && !STRSTARTS(?imdb, 'ch')) }