Increases in rent or contribution of any recipient
Any rent or contribution of any recipient or any tenant in a project assisted under subsection (a)(5) shall not increase as a result of this section, any amendment thereto, or any other provision of Federal law or regulation by more than 10 per centum during any twelve-month period, unless the increase above 10 per centum is attributable to increases in income which are unrelated to this subsection or other law or regulation.