This subsection provides: " If any person fails to make the return required by any notice given under subsection (2) of section 22 and has not made a. return or a revised return under sub section (3) of the same section or fails to comply with all the terms of a notice issued under sub section (4) of the same section or, having made a return, fails to comply with all the terms of a notice issued under subsection (2) of this section, the Income tax Officer shall make the assessment to the best of his judgment and determine the sum payable by the assessee on the basis of such assessment and, in the case of a firm, may refuse to register it or may cancel its registration if it is already registered: Provided that the registration of a firm shall not be cancelled until fourteen days have elapsed from the issue of a, notice by the Income tax Officer.to the firm intimatiiig his intention to cancel its registration" This provision clearly shows that the person to whom the first part of the provision refers includes a firm and it lays down that if a firm commits a default as indicated the Income tax Officer may refuse to register it or may cancel its registration if it is already registered.