51.3196—U.S. Combination.
U.S. Combination consists of a combination of U.S. No. 1 and U.S. No. 2 onions: Provided, That at least 50 percent, by weight, of the onions in each lot meet the requirements of U.S. No. 1 grade. (See §§ 51.3198 and 51.3199.)