Deduction under section 35AC: specified institutions and projects approved for allowable tax deductions for eligible project costs. Approval under section 35AC lists four specified institutions with identified eligible projects or schemes, each accompanied by an estimated project cost and the maximum amount of that cost permitted as a deduction under section 35AC. The notification limits the duration of the approvals by reference to particular assessment years, distinguishing one project's two-year scope from the three-year scope applicable to the other three projects.