Crossword Puzzle

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Across
  1. 1. acronym for Master of Science
  2. 4. Knowlege or skill in a particular job
  3. 5. One plus one equals?
  4. 6. First word of the alphabet
  5. 7. which is missing: Four, fore and ?
Down
  1. 2. to move slowly at a steady pace
  2. 3. Carried within or entering a ship