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the total of each such portion of each amount, if any, by which the cost to the corporation of acquiring a bond, debenture, mortgage, hypothecary claim, note or other similar obligation owned by the corporation at the end of the year exceeds the principal amount of the bond, debenture, mortgage, hypothecary claim, note or other similar obligation, as the case may be, at the time it was so acquired as was deducted by the corporation in computing its profit for the year;