title: json multiple keys with same value?
body: <p>need to store in json different keys with same value, like this:</p>
  
  <pre><code>{
    "key1" : "valueA",
    "key2" : "valueA",
    "key3" : "valueA",
    "key4" : "valueB",
    "key5" : "valueB",
    "key6" : "valueB",
  }
  </code></pre>
  
  <p>But because there will be many keys associated with the same value, is there an option to optimize the code, e.g. using an array for the keys? This was throwing me errors... </p>
  
  <pre><code>{
    ["key1","key2","key3"] : "valueA",
    ["key4","key5","key6"] : "valueB
  }
  </code></pre>