Prefix puzzle

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Across
  1. 5. an instrument to sing into
  2. 7. a machine for making instant copies
  3. 8. to sale over the telephone
Down
  1. 1. communication between minds
  2. 2. to go around or bypass; avoid
  3. 3. to go around (the earth for example)
  4. 4. fear of light
  5. 6. very small; tiny