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a) HashSet<String> listToSet = new HashSet<String>(duplicateList);
b) HashSet<String> listToSet = duplicateList.toSet();
c) HashSet<String> listToSet = Collections.convertToSet(duplicateList);
d) HashSet<String> listToSet = duplicateList.getSet();
a
Explanation: Duplicate elements are allowed in List. Set contains unique objects.