testcases:
  - name: "testcase 1"
    inputs:
    - 1 : [1, 2, 2, 3, 3, 4]
    output: 
    - 1 : [1, 4]
  - name: "testcase 2"
    inputs:
    - 1: [2, 1, 1, 8]
    output:
    - 1 : [2, 8]
  - name: "testcase 3"
    inputs:
    - 1:  [4, 1, 2, 1, 2, 0]
    output:
    - 1: [0, 4]
  - name: "testcase 4"
    inputs:
    - 1: [2, 5]
    output:
    - 1: [2, 5]
  - name: "testcase 5"
    inputs:
    - 1: [4, 5, 4, 1, 1, 2, 6, 6]
    output:
    - 1: [5, 2]