exercise

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Across
  1. 3. any of various chiefly tropical birds
  2. 4. the process of working together to the same end.
Down
  1. 1. cause or allow (something, especially food or drink) to pass down the throat.
  2. 2. (of an animal, typically a bird or fish) move from one region or habitat to another according to the seasons.
  3. 4. very often; frequently.