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function createSubTree(level, width, prefix) {
  if (level > 0) {
    var res = [];
    for (var i = 1; i <= width; i++) {
      res.push({ 
        name: 'Node ' + prefix + i, 
        id: 'id' + prefix + i,
        childs: createSubTree(level - 1, width, prefix + i + '.')
      })
    } 
  } else {
      return [];
  }
}