ONCE the Lok Sabha results came in, President Shankar Dayal Sharma made up his mind to call the single largest party. Outlook 's enquiries in Rashtrapati Bhawan reveal that even if P.V. Narasimha Rao's letter to the President promising support to the National Front had arrived 24 hours earlier, it would have made no difference to his original decision to invite the BJP to form the Government.