---
ch-1:
  - function: goodstrings
    multiarg: true
    arguments:
      - - cat
        - bt
        - hat
        - tree
      - atach
    result: 6
  - multiarg: true
    arguments:
      - - hello
        - world
        - challenge
      - welldonehopper
    result: 10
ch-2:
  - function: arithmeticsubsequence
    arguments:
      - 9
      - 4
      - 7
      - 2
      - 10
    result: 3
  - arguments:
      - 3
      - 6
      - 9
      - 12
    result: 4
  - arguments:
      - 20
      - 1
      - 15
      - 3
      - 10
      - 5
      - 8
    result: 4