title: Does Murmurhash have collisions on 32-bit inputs?
body: <p>Consider the standard Murmurhash, giving 32-bit output values.</p>
  <p>Suppose that we apply it on 32-bit inputs -- are there collisions?</p>
  <p>In other words, does Murmurmash basically encodes a permutation when applied to 32-bit inputs?
  If collisions exist, can anyone give an example (scanning random inputs didn't yield any)?</p>