npm install robiner

• r = round
• a = participant a
• b = participant b

robiner(3);

[
  {
    "r": 1,
    "a": 0,
    "b": null
  },
  {
    "r": 1,
    "a": 1,
    "b": 2
  },
  {
    "r": 2,
    "a": 0,
    "b": 2
  },
  {
    "r": 2,
    "a": null,
    "b": 1
  },
  {
    "r": 3,
    "a": 0,
    "b": 1
  },
  {
    "r": 3,
    "a": 2,
    "b": null
  }
]