**题目：**假设有一段英文文本，其中有重复的单词，要求去除重复单词，只保留一个，例如"This is is a desk.",程序输出为”This is a desk.“
代码如下：
l = []
s = "hello,i is is a student"
for i in s.split(" "):
if i not in l:
l.append(i)
result = " ".join(l)
print(result)
输出结果：
This is a desk.
**题目：**假设有一段英文文本，其中有重复的单词，要求去除重复单词，只保留一个，例如"This is is a desk.",程序输出为”This is a desk.“
代码如下：
l = []
s = "hello,i is is a student"
for i in s.split(" "):
if i not in l:
l.append(i)
result = " ".join(l)
print(result)
输出结果：
This is a desk.
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