Inter: between, within, among

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Across
  1. 2. on the inside
  2. 3. to come between to alter a result
  3. 7. occurring at irregular intervals
  4. 8. to scatter between other things
  5. 9. connect or link closely
Down
  1. 1. to interrupt as in a comment or remark
  2. 2. to insert
  3. 4. to obstruct something from continuing to its destination
  4. 5. between nations
  5. 6. a period between as in a play