testcases:
  - name: "testcase 1"
    inputs:
    - 1 : [1]
    output: 
    - 1 : [[1]]
  - name: "testcase 2"
    inputs:
    - 1: [1,2]
    output:
    - 1 : [[], [1], [2], [1, 2]]
  - name: "testcase 3"
    inputs:
    - 1: [2,5,7]
    output:
    - 1 : [[], [2], [5], [2, 5], [7], [2, 7], [5, 7], [2, 5, 7]]
  - name: "testcase 4"
    inputs:
    - 1: [1,2,3,4]
    output:
    - 1 : [[], [1], [2], [1, 2], [3], [1, 3], [2, 3], [1, 2, 3], [4], [1, 4], [2, 4], [1, 2, 4], [3, 4], [1, 3, 4], [2, 3, 4], [1, 2, 3, 4]]
  - name: "testcase 5"
    inputs:
    - 1: [0]
    output:
    - 1 : [[], [0]]