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function org(arr) {
  let managers = {};
  
  function getChart(level, people) {
    for (let reportee = 0; reportee < people.length; ++reportee) {
        let newManager = people[reportee];
        if (managers[newManager] !== undefined) {
          print(level, people[reportee]);
          getChart(level + 1, managers[people[reportee]]);
          delete managers[people[reportee]];
        } else {
          print(level, people[reportee]);
        } 
      }
  }
  function print(level, person) {
    console.log('....'.repeat(level) + person);
  }
  for (let i = 0; i < arr.length; ++i) {
    let people = arr[i];
    let manager = people[0];
    managers[manager] = people.split(',').slice(1);
  }
  let keys = Object.keys(managers);
  let level = 0;
  for (let key = 0; key < keys.length; ++key) {
    if (managers[keys[key]] !== undefined) {
      print(level, [keys[key]]);
      let reportees = managers[keys[key]];
      getChart(level + 1, reportees);
    }
  }
}
org([
    'A,B,C,D',
    'B,E,F',
    'D,G,I',
    'G,H',
]);