- setup:
  cleanup:
  args:     3 1 4 2
  input:
  output:   (1 4 2)
- setup:
  cleanup:
  args:     1 2 3 4
  input:
  output:   ()
- setup:
  cleanup:
  args:     1 3 2 4 6 5
  input:
  output:   (1 3 2)
- setup:
  cleanup:
  args:     1 3 4 2
  input:
  output:   (1 3 2)