Art

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Across
  1. 4. Extremely famous painting by Leonardo da Vinci
  2. 5. A kind of Army airplane
  3. 7. Dinner painting by da Vinci
Down
  1. 1. The birth of a planet close to the sun
  2. 2. A flaming month after May
  3. 3. Painting about a very starry night
  4. 6. All spaces are replaced by this sign _; The answer of this note.