In reply to megamind:
The main issue I see is how can you expect out an array of 4 bits elements have them all unique and greater than 10, when there are only 5 combinations (11, 12, 13, 14, 15) meeting that criteria, also as you stated in your code the size method cannot be assigned in the pre randomize method, you can set the size using new, or in a constraint x.size()== 10.
HTH,
-R