� variables are the presence or absence of each word in
the language; the assumption is that words occur independently in
documents, with frequencies determined by the document category.<br>

1.  Explain precisely how such a model can be constructed, given as
    “training data” a set of documents that have been assigned
    to categories.<br>

2.  Explain precisely how to categorize a new document.<br>

3.  Is the conditional independence assumption reasonable? Discuss.<br>
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