---
ch-1:
  - function: reversepairs
    arguments:
      - 1
      - 3
      - 2
      - 3
      - 1
    result: 2
  - arguments:
      - 2
      - 4
      - 3
      - 5
      - 1
    result: 3
ch-2:
  - function: floorsum
    arguments:
      - 2
      - 5
      - 9
    result: 10
  - arguments:
      - 7
      - 7
      - 7
      - 7
      - 7
      - 7
      - 7
    result: 49