Given the following "response" or array of objects, what would be the most efficient way to get the desired results. There must be an easier way than the exhaustive and tedious way I'm doing it now. A LINQ solution would be fantastic.

Situation #1

<things>
  <thing id="1">
    <feature>Tall</feature>   
  </thing>
  <thing  id="2">
    <feature>Tall</feature>   
  </thing>
  <thing  id="3">
    <feature>Tall</feature>   
    <feature>Wide</feature>
  </thing>
  <thing  id="4">
    <feature>Tall</feature>   
  </thing>
</things>

Result: Wide

Situation #2

<things>
  <thing id="1">
    <feature>Short</feature>   
  </thing>
  <thing  id="2">
    <feature>Tall</feature>   
  </thing>
  <thing  id="3">
    <feature>Tall</feature>   
    <feature>Wide</feature>
  </thing>
  <thing  id="4">
    <feature>Tall</feature>   
  </thing>
</things>

Result: Wide, Short, Tall

Situation #3

<things>
  <thing id="1">
    <feature>Tall</feature> 
    <feature>Thin</feature>   
  </thing>
  <thing  id="2">
    <feature>Tall</feature>   
  </thing>
  <thing  id="3">
    <feature>Tall</feature>   
    <feature>Wide</feature>
  </thing>
  <thing  id="4">
    <feature>Tall</feature>   
  </thing>
</things>

Result: Wide, Thin

Thanks.