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function waitUntil(num, str) {
  //inside here we'll do a standard set time document
  var promise = new Promise(function(resolve, reject) {
    setTimeout(function() {
      resolve(str);
    }, num);
      
  });
  
  return promise;
  
  }
  
  waitUntil(2000, 'hello')
  .then(function(res) {
  console.log(res);
  return waitUntil(1000, 'world');
  })
  .then(function(res) {
    console.log(res);
    return waitUntil(55, '!');
    
  })
  
  .then(function(res) {
    console.log(res);
  });
  
  //Making calls to weather api, waiting for weather data from other website.