an assessee has sold 3 different assets in 3 different f.y (capital gain say for rs. 1 cr. each). he started constructing a singly residential house property after sale of the first asset sold. the house is still under construction. the estimated expenditure is rs. 5 cr. can the assessee claim exemption on all the three houses u/s 54f against the construction of the single residential house. plz give reference to relevent case laws.