title: Find partial tuple in list of tuple
body: <p>I've a list of tuples</p>
  
  <p>Es:</p>
  
  <pre><code>[('a','b','c','d','e'),
   ('f','g','h','i','l'),
   ('m','n','o','p','q'),
   ('r','s','t','u','v'),
   ('z', 'aa', 'ab', 'ac', 'ad'),
   .....]
  </code></pre>
  
  <p>The length of the tuple is not always the same. In the example is 5 but can change</p>
  
  <p>I've one element (partial tuple) to find.</p>
  
  <p>The length of element is not always the same.</p>
  
  <p>I'm looking for the position of element in tuples.</p>
  
  <p>The length of the element to look for is always less or equal than the length of the tuples.</p>
  
  <p>The order of items to look for is "correct", meaning that cases of type ('m', 'o') does not exist</p>
  
  <p>Es:</p>
  
  <pre><code>find ('m','n')
  result 2
  
  find ('z','aa','ab')
  result 4
  </code></pre>