S. 54F : Capital gains-Investment in a residential house-Two residential house-One unit co-owned by assessee and wife-Ownership of more than one house-Not absolute owner-Denial of exemption is not valid-Under construction house-Income cannot be assessed as income from house property-Till time of possession condition stipulated in clause (b) of proviso to section 54F(1) was not satisfied-Denial of exemption is not valid. [S. 22, 45]