Deduction under section 35AC: notification approves specified institutions' projects and maximum deductible project costs for approved periods. Notification under section 35AC designates specific institutions and approves listed projects and estimated costs, specifying the maximum portion of those costs that may be allowed as a deduction under section 35AC for the stated approval periods commencing with the 2011-12 financial year; most projects are approved for a three year period while one project is approved for a two year period as indicated.