testcases:
  - name: "testcase 1"
    inputs:
    - 1 : [1, 2, 3, 4]
    output: 
    - 1 : [1, 3, 2, 4]
  - name: "testcase 2"
    inputs:
    - 1 : [10, 1, 2, 3, 4, 5]
    output: 
    - 1 : [10, 2, 1, 3, 4, 5]
  - name: "testcase 3"
    inputs:
    - 1 : [28, 21, 14, 7]
    output: 
    - 1 : [28, 14, 21, 7]
  - name: "testcase 4"
    inputs:
    - 1 : [11, 12, 13, 14, 15]
    output: 
    - 1 : [11, 13, 12, 15, 14]
  - name: "testcase 5"
    inputs:
    - 1 : [1, 2]
    output: 
    - 1 : [1, 2]