S. 144B : Faceless Assessment-Proposed variation in income-Standard operating procedure-Order shall not be passed prior to expiry of seven days from date of issuance of show-cause-Violation of principles of natural justice-Assessment order and consequential notices of demand and penalty set aside-Matter remanded. [142(1), 143(3), 144B(6)(vii), 156, 272A(1)(d), 274, Art.226]