Mono, uni, bi

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Across
  1. 2. I am on your phone and a board game but one has go in it
  2. 3. I have one horn
  3. 4. I have two wheels
  4. 5. I talk very boring that will make everyone go to sleep
Down
  1. 1. I have one wheel you can see a clown riding me in the circus
  2. 4. I am a word you can describe something with two legs