title: How to convert list of lists into tuples in Haskell, adding some specifications
body: <p>I have a list of lists : <code>[[43525,3,2],[43615,2,2],[41111,1,2],[74855,5,3]]</code><br/>
  I want to convert this list into a list of tuples, taking only the second and the last elements of every list. And adding <code>15*i</code> every time I map on the list (<code>i</code> is the index).</p>
  <p>taking the first example:
  <code>[[43525,3,2],[43615,2,2],[41111,1,2],[74855,5,3]]</code><br/>
  I want somthing like :
  <code>[(3,2) , (17, 2), (31, 2), (50, 3)]</code></p>
  <p><code>17 = 3+(15*1)</code><br/>
  <code>31 = 1+(15*2)</code><br/>
  <code>50 = 5+(15*3)</code><br/></p>
  <p>I already create a function that take a list of lists and convert it to a list of tuples: <br/>
  From this <code>[[43525,3,2],[43615,2,2],[41111,1,2],[74855,5,3]]</code><br/>
  to this <code>[(3,2),(2,2),(1,2),(5,3)]</code></p>
  <pre><code>    tupleInfo [[]] = []
      tupleInfo [[_,x,y]] = [(x,y)]
      tupleInfo list = map (\[_,x,y] -&gt; (x,y)) list 
  </code></pre>