testcases:
  - name: "testcase 1"
    inputs:
    - 1 : 0
    output: 
    - 1 : 0
  - name: "testcase 2"
    inputs:
    - 1: 1
    output:
    - 1 : 1
  - name: "testcase 3"
    inputs:
    - 1 : 2
    output: 
    - 1 : 1
  - name: "testcase 4"
    inputs:
    - 1: 3
    output:
    - 1 : 2
  - name: "testcase 5"
    inputs:
    - 1 : 4
    output: 
    - 1 : 4