1 votes 1 votes L = {ww' : w ∈ {a, b}*}, where w' stands for w with each occurrence of a replaced by b, and vice versa Is this CFL ?? atul_21 asked Jan 4, 2018 atul_21 211 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Ashwin Kulkarni commented Jan 4, 2018 reply Follow Share No I don't think it's CFL. Because we need to check ww first and then change it to ww'. 1 votes 1 votes atul_21 commented Jan 4, 2018 i edited by atul_21 Jan 4, 2018 reply Follow Share L2 = {wRw" : w ∈ {a, b}* and w" indicates w with each occurrence of a replaced by b, and vice versa}. what about this one? this one is NCFL . right?? 0 votes 0 votes Please log in or register to add a comment.