Making plurals from nouns ending in f or fe

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Across
  1. 3. elf
  2. 5. leaf
  3. 8. half
  4. 9. loaf
  5. 10. thief
Down
  1. 1. knife
  2. 2. calf
  3. 4. scarf
  4. 6. shelf
  5. 7. wolf