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<pre><code>In [8]: l
Out[8]:
[['a', 'b', 'c'],
['b', '', ''],
['a', '', ''],
['a', 'c', 'd'],
['b', 'c', ''],
['b', 'c', '']]
In [9]: [ filter(None, a) for a in l]
Out[9]: [['a', 'b', 'c'], ['b'], ['a'], ['a', 'c', 'd'], ['b', 'c'], ['b', 'c']]
</code></pre>