擅长：python、mysql、java
<p>这将打印所有不同的行</p>
<pre><code>from itertools import combinations
final=set()
with open('keywords.txt') as file:
for line in file:
words=line.strip().split()
for i in range(2,len(words)):
for j in combinations(words,i):
final.add(' '.join(j))
print '\n'.join(final)
</code></pre>
