The unity of INDIA opposition bloc has suffered back-to-back setbacks within hours, with the Aam Aadmi Party (AAP) declaring that it will contest all Lok Sabha seats in Punjab, shortly after Trinamool chief Mamata Banerjee ruled out any alliance with Congress in West Bengal. "The Aam Aadmi Party has shortlisted 40 candidates for the 13 Lok Sabha seats in Punjab. We are getting a survey done before finalising candidates," Punjab Chief Minister Bhagwant Mann said today.