---
ch-1:
  - function: keyboardword
    arguments:
      - Hello
      - Alaska
      - Dad
      - Peace
    result:
      - Alaska
      - Dad
  - function: keyboardword
    arguments:
      - OMG
      - Bye
    result: []
ch-2:
  - function: h_index
    arguments:
      - 10
      - 8
      - 5
      - 4
      - 3
    result: 4
  - function: h_index
    arguments:
      - 25
      - 8
      - 5
      - 3
      - 3
    result: 3