sentence(["orange", "apple", "pear"]) ➞ "An orange, an apple and a pear."

sentence(["keyboard", "mouse"]) ➞ "A keyboard and a mouse."

sentence(["car", "plane", "truck", "boat"]) ➞ "A car, a plane, a truck and a boat."

self.assertEqual(sentence(["orange", "apple", "pear"]), "An orange, an apple and a pear.")
self.assertEqual(sentence(["keyboard", "mouse"]), "A keyboard and a mouse.")
self.assertEqual(sentence(["car", "plane", "truck", "boat"]), "A car, a plane, a truck and a boat.")
self.assertEqual(sentence(["mom", "dad"]), "A mom and a dad.")
self.assertEqual(sentence(["school", "hospital", "library"]), "A school, a hospital and a library.")
self.assertEqual(sentence(["aa", "ee", "ii", "oo", "uu", "vv", "tt", "qw", "zz"]), "An aa, an ee, an ii, an oo, an uu, a vv, a tt, a qw and a zz.")

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