---
ch-1:
  - function: specialnumbers
    arguments:
      - 1
      - 2
      - 3
      - 4
    result: 21
  - arguments:
      - 2
      - 7
      - 1
      - 19
      - 18
      - 3
    result: 63
ch-2:
  - function: uniquesumzero
    arguments: 5
    result:
      - 1
      - 2
      - 3
      - 4
      - -10
  - arguments: 3
    result:
      - 1
      - 2
      - -3
  - arguments: 1
    result:
      - 0