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The exercice is validated is all questions of the exercice are validated
The question 1 is validated if the output of the CountVectorizer is
<6588x500 sparse matrix of type '<class 'numpy.int64'>'
	with 79709 stored elements in Compressed Sparse Row format>
The question 2 is validated if the output of print(df.iloc[:3,400:403].to_markdown()) is:
|    |   talk |   team |   tell |
|---:|-------:|-------:|-------:|
|  0 |      0 |      0 |      0 |
|  1 |      0 |      0 |      0 |
|  2 |      0 |      0 |      0 |
The question 3 is validated if the shape of the wordcount DataFrame (6588, 501) is and if the output of print(df.iloc[300:304,499:501].to_markdown()) is:
|     |   youtube |   label |
|----:|----------:|--------:|
| 300 |         0 |       0 |
| 301 |         0 |      -1 |
| 302 |         1 |       0 |
| 303 |         0 |       1 |