# code: http://golf.shinh.org/reveal.rb?Duplicate+characters/tails_1642045013&nbb
# target Nibbles version: 0.21
# commenter version: 0.1.2.181

#(implicit string concatenation):[chr] 
    + #(concat):[chr] 
        . #(map):[[chr]] 
            fstLine #(@):[chr] 
            \A 
            ^ #(replicate):[chr] 
                2 #(integer):int 
                A #($):chr 
    "\n" #(string):[chr]