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a = [ 1,   9,   3,   4,   5,   6,   7,   2,   4,   3 ]
b = ['x', 'y', 'z', 'z', 'a', 'z', 'z', 'z', 'b', 'c']
...
    else:
        anew.append(n)
print anew

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```
[1, 9, 3, 5, 6, 4, 3]
```