S.32: Depreciation-Intangible asset-Slump sale-Acquisition of manufacturing, supply and maintenance contracts-Goodwill-AO is directed to treat the excess of consideration paid over and above the fair market value of the assets and liabilities as goodwill and allow depreciation-Depreciation-Unabsorbed-Carry forward and set off-set off of brought forward unabsorbed depreciation pertaining to asst. yr. 2008-09 cannot be denied on the basis that for that assessment year the assessee filed its return of income under S. 139(4) [S.2(42C),32(1)(ii), 32(2), 50B, 72, 80,139(4)]