query: #title: Birthdates too far away
  # Complex constraint from [[Property talk:P3373]]
  # Items that are siblings but with birthdate more than 100 years away.
  SELECT * WHERE {
    ?item wdt:P3373 ?item2 ; wdt:P569 ?date1. 
    ?item2 wdt:P3373 ?item ; wdt:P569 ?date2.
    filter (abs(?date1 - ?date2) > 36500 )
  }