The words “for gain or loss upon a sale or exchange and for depreciation under the applicable Federal income-tax laws” and “or vessels exchanged for credit upon the acquisition of such new vessel” are omitted as unnecessary. In paragraph (1), the words “the difference between the cost of the new vessel and the trade-in allowance of the obsolete vessel” are substituted for “the amount of the cost of such vessel (other than the cost represented by such obsolete vessel or vessels)” for clarity.