This is one of the questions in BAT's pre-test.
抽抽樂總共有五種獎項, 1,2 獎各只有一個, 3 獎有 2 個，4 獎有 5 個，5 獎有 11 個，請寫出一個程式可以「隨機」的取得「不重複」的禮物， 且：
重點請放在抽獎這件事情上 抽獎的本質就是不重複的隨機抽取
例如 3 獎是 3 隻 iPhone，iPhone A 被抽走了，給人了，理所當然就不能再被抽，但是，抽獎箱內還有 iPhone B 跟 iPhone C 可以抽！！
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