The BJP will launch 'Paribartan Yatra' across West Bengal on Sunday in a bid to sharpen anti-incumbency against the TMC and test its grassroots machinery ahead of the assembly polls this year. The programme will kick off a day after the publication of the revised electoral rolls under the Special Intensive Revision (SIR) exercise in the state. During the SIR process, around 63.66 lakh names, nearly 8.3 per cent of the electorate, have been deleted from the state voter list since the exercise began in November last year, reducing the elector base to over 7.04 crore. The 5,000-km outreach initiative is designed as both a mass-contact exercise and an organisational stress test aimed at converting booth-level groundwork into visible street mobilisation, a party leader said. Nine yatras will originate from Cooch Behar, Krishnanagar, Kulti, Garbeta, Raidighi, Islampur, Hasan, Sandeshkhali and Amta, traversing every assembly constituency before culminating in a Brigade Parade Ground rally