testcases:
  - name: "testcase 1"
    inputs:
    - 1 : [100, 50, 200, 25, 75, 300, 10, 350, 15]
    output:
    - 1 : "100 : 50, 200 : 25, 75, 300, 10 : 350, 15"

  - name: "testcase 2"
    inputs:
    - 1 : [25, 50, 75, 100, 200, 350]
    output:
    - 1 : "25 : 50, 75 : 100, 200, 350"

  - name: "testcase 3"
    inputs:
    - 1 : []
    output:
    - 1 : "None"

  - name: "testcase 4"
    inputs:
    - 1 : [100]
    output:
    - 1 : "100"

  - name: "testcase 5"
    inputs:
    - 1 : [350, 200, null, 75, 50, 25]
    output:
    - 1 : "350 : 200 : 75, 50 : 25"