initialize(["Stephen Hawking"]) ➞ ["S. H."]

initialize(["Harry Potter", "Ron Weasley"]) ➞ ["H. P.", "R. W."]

initialize(["Sherlock Holmes", "John Watson", "Irene Adler"]) ➞ ["S. H.", "J. W.", "I. A."]

self.assertEqual(initialize(["Stephen Hawking"]), ["S. H."])
self.assertEqual(initialize(["Harry Potter", "Ron Weasley"]), ["H. P.", "R. W."])
self.assertEqual(initialize(["Sherlock Holmes", "John Watson", "Irene Adler"]), ["S. H.", "J. W.", "I. A."])

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