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function guid() {
    function s4() {
        return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);
    }
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
        s4() + '-' + s4() + s4() + s4();
}

function chunk(size, array) {
  const result = [];

  while(array.length > 0){
    result.push(array.splice(0, size))
  }

  return result;
}