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Across
  1. 2. performing, involving, or adept at spectacular gymnastic feats:
  2. 4. containing or relating to alcohol:
  3. 5. relating to education and scholarship:
  4. 7. having the properties of an acid, or containing acid; having a pH below 7.
Down
  1. 1. physical rather than biological; not derived from living organisms:
  2. 2. relating to, involving, or requiring free oxygen:
  3. 3. relating to geometry, or according to its methods.
  4. 6. an occasion when a packed meal is eaten outdoors, especially during an outing to the countryside: