11. The method of claim 10 wherein all possible sub-sets where n is 1 are chosen before any sub-sets are chosen where n is 2 and where all possible sub-sets where n is 2 are chosen before any sub-sets are chosen where n is 3.
11. The method of claim 10 wherein all possible sub-sets where n is 1 are chosen before any sub-sets are chosen where n is 2 and where all possible sub-sets where n is 2 are chosen before any sub-sets are chosen where n is 3. 13. The method of claim 11 wherein all possible sub-sets where n is 1 are chosen before any sub-sets are chosen where n is 2 and where all possible sub-sets where n is 2 are chosen before any sub-sets are chosen where n is 3.