title: ruby - iterate through a hash containing key/array value pairs, and iterate through each value
body: <p>I have an hash that looks like this:</p>
  
  <pre><code>{
    "key1": [
       "value1",
       "value2",
       "value3"
    ],
    "key2": [
       "value1",
       "value2",
       "value3",
       "value4",
       "value5"
    ],
    "key3": [
       "value1"
    ],
    "key4": [
       "value1",
       "value2"
    ]
  }
  </code></pre>
  
  <p>How do I iterate through every keyN, while also looping through all the values in that key?</p>
  
  <p>I have an array with all the keys if that helps.</p>
  
  <p>Thanks</p>