ListValuedMap<String,String> listValuedMap = new ArrayListValuedHashMap();
listValuedMap.put("United States", "Washington");
listValuedMap.put("Canada", "Ottawa");
listValuedMap.put("Canada", "Ottawa");
listValuedMap.put("South Africa", "Pretoria");
listValuedMap.put("South Africa", "Cape Town");
listValuedMap.put("South Africa", "Bloemfontein");
listValuedMap.entries().forEach(System.out::println);
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List<Integer> list1 = Arrays.asList(1, 2);
List<Integer> list2 = Arrays.asList(4, 5);
Stream.of(list1, list1)
.flatMap(list -> list.stream())
.forEach(System.out::println);
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