title: Friends in common java?
body: <p>my idea is this.
  I want to create a script, linking mutual friends</p>
  
  <p>For example:</p>
  
  <p>Friends of Damian = [Cristian, Pedro, Juan, Andres]</p>
  
  <p>Friends of Andres = [Marcela, Damian, Julian, Carlos]</p>
  
  <p>Friends of Lucas = [John, Damian, Andres, Francisco]</p>
  
  <p>Friends of Roman = [Albert, Lourdes, Jennifer, Diego]</p>
  
  <p>Friends of Diego = [Magali, Brian, Andrew, Peter]</p>
  
  <p>Friends of Brian = [Etc.]</p>
  
  <p>Friends of Leo = [Etc.]</p>
  
  <p>Friends of Ramiro = [Etc.]</p>
  
  <p>Friends of Franco = [Etc.]</p>
  
  <p>I should select 5 names, and I would have to say if any friends in common and what are the names. The names will be limited to 60 approx. And they will be 4 names for groups.</p>