Narwhal Unicorn of the Sea

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Across
  1. 3. forming new ideas, or images or objects not present to the senses
  2. 5. a group of sea mammals, like whales and narwhals
  3. 6. a long, horn-like tooth
Down
  1. 1. a flat cake that has deep square marks on both sides
  2. 2. a machine controlled by a computer program or electric circuitry
  3. 4. a call used to greet someone or draw attention to something from a distance