---
ch-1:
  - function: commoncharacters
    arguments:
      - java
      - javascript
      - julia
    result:
      - j
      - a
  - arguments:
      - bella
      - label
      - roller
    result:
      - e
      - l
      - l
  - arguments:
      - cool
      - lock
      - cook
    result:
      - c
      - o
ch-2:
  - function: unequaltriplets
    arguments:
      - 4
      - 4
      - 2
      - 4
      - 3
    result: 3
  - arguments:
      - 1
      - 1
      - 1
      - 1
      - 1
    result: 0
  - arguments:
      - 4
      - 7
      - 1
      - 10
      - 7
      - 4
      - 1
      - 1
    result: 28