Mom's Christmas Gift

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Across
  1. 2. Key signature with one flat
  2. 5. Shortest month of the year
  3. 7. Fashionable, trendy
Down
  1. 1. Winnipeg’s symphony (initials)
  2. 3. Crime at the center of a whodunit
  3. 4. Lucky number
  4. 6. Symbolized by @