title: How do I sum the inner sequence in a list of lists?
body: <p>I want to take a sequence of sequences and sum up each inner sequence.</p>
  <p>Data ((1 2 3) (2 3 4) (3 4 5) (4 5 6))</p>
  <p>Desired output ((6) (9) (12) (15)) or (6 9 12 15)</p>
  <p>I've tried <code>apply map +</code> which doesn't give the desired output. I've also experimented with reduce.</p>