for (int i = 1; i <= 15; i++) {
/* pop i things from the shuffled list into the list remove,
* then remove them in a bulk operation.
*/
LinkedList<TrustGraphNodeId> remove = new LinkedList();
for (int j = 0; j < i; j++) { remove.push(shuffled.pop()); }
rt.removeNeighbors(remove);
// make sure they're gone.
for (TrustGraphNodeId n : remove) { assertFalse(rt.contains(n)); }