order of operations

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Across
  1. 3. The 3rd or 4th depending left to right
  2. 4. The first order in operations
  3. 6. The 5th or 6th depending left to right
Down
  1. 1. The 3rd or 4th depending left to right
  2. 2. The second order in operations
  3. 5. The 5th or 6th depending left to right