Words using Ph

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Across
  1. 3. A diagram we use in maths
  2. 4. Largest living land animal
  3. 7. Use this device to talk to people in other places
Down
  1. 1. 26 Letters
  2. 2. Singers sing into this device
  3. 5. Another word for a ball
  4. 6. Large, silver grey sea mammal