title: Microsoft LUIS mistakes different letters for the same one
body: <p>I'm using several large List Entities in Microsoft LUIS. To import these lists in different LUIS apps, and also for a more convenient workflow, I want to import these lists as JSON files. In general, this works but for some lists I get the following error message:</p>
  <p><a href="https://i.stack.imgur.com/tTCyv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tTCyv.png" alt="Error message while using the import" /></a></p>
  <p>Unfortunately, this error message doesn't provide any clue to problematic entries. So, I tried to make smaller lists and eventually found the problem. I had these two items in the list:
  &quot;A<strong>th</strong>ena&quot; and &quot;A<strong>þ</strong>ena&quot;. According to wikipedia, <strong>þ</strong> is an Icelandic letter which is pronouced similarly to <strong>th</strong>, and was therefore often replaced in the past. However, those two words lead to a 409 error if entered manually.</p>
  <p><a href="https://i.stack.imgur.com/XxqvN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XxqvN.png" alt="enter image description here" /></a>
  <a href="https://i.stack.imgur.com/cnT1Y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cnT1Y.png" alt="enter image description here" /></a></p>
  <p>Of course, I can just remove one of the entries, and also handle the þ letter in a script, but I would like to know if there is a list of letters that are treated in the same way, which may lead to the same issue. I didn't find anything in the documentation. If you deal with many large entity lists that may grow in the future, it is not very practical to track down those cases individually.</p>
  <p><strong>Edit</strong>
  Also I found that the letter <strong>æ</strong> is interpreted as <strong>ae</strong>.</p>