The Shwa was here!

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Across
  1. 3. disappeared
  2. 4. plastic
  3. 6. sort of invisible
  4. 7. with Shwa's face
  5. 8. friends with the Shwa
  6. 9. Blind
Down
  1. 1. in a wheelchair
  2. 2. number of dogs
  3. 5. Gives Shwa an explanation