ALL:
  java/util/HashSet.add(e: E): Boolean
  java/util/AbstractCollection.add(e: E!): Boolean
  kotlin/collections/MutableSet.add(element: E): Boolean
  kotlin/collections/MutableCollection.add(element: E): Boolean
DIRECT:
  java/util/HashSet.add(e: E): Boolean
  kotlin/collections/MutableSet.add(element: E): Boolean
INTERSECTION:
  java/util/LinkedHashSet.add(e: E!): Boolean
