title: Problem with creating dictionary with gensim for LDA
body: <p>I have a problem running gensim to create a Dictionary and the Doc Term Matrix.</p>
  <p>When I run:</p>
  <pre><code>from gensim import corpora, models
  import gensim
  clean = ['door', 'cat', 'mom']
  dictionary = corpora.Dictionary(clean)
  </code></pre>
  <p>I get:</p>
  <pre><code>doc2bow expects an array of unicode tokens on input, not a single string
  </code></pre>
  <p>In the real problem, Clean is still a list-type variable. It's all the words in a large corpus after applying a tokenizer, tagger, removing punctuation, etc.</p>
  <p>Why am I getting this error?</p>