We are asked to say whether a loss sustained by an individual taxpayer upon the foreclosure sale of his interest in real estate, acquired for profit, is a loss which, under 23(e)(2) of the 1934 Revenue Act, 48 Stat. 680, may be deducted in full from gross income for the purpose of arriving at taxable income, or is a capital loss deductible only to the limited extent provided in 23(e)(2), (j), and