S. 153C : Assessment-Income of any other person-Search-Validity-Jointly conducted-Three persons and firm-Firm would not require to be dealt with under section 153C, but would be under section 153A; however, if material collected in search against such person is used against other person, then proceeding can be taken under section 153C and not under section 153A-Matter remanded. [S. 153A, Art. 226]