# code: http://golf.shinh.org/reveal.rb?Diamond+Matrix/tails_1645408803&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

#(implicit map):[[chr]] 
    : #(append):[int] 
        , #(range from 1):[int] 
            $ #(= fstInt):int 
        >> #(tail):[int] 
            \ #(reverse):[int] 
                , #(range from 1):[int] 
                    $ #(= fstInt):int 
    : #(append):[chr] <--arg( B:int A:int ) 
        ^ #(replicate):[chr] 
            - #(subtract):int 
                _ #(= fstInt):int 
                $ #(= B):int 
            " " #(string):[chr] 
        ^ #(pow):int 
            / #(divide):int 
                ^ #(pow):int 
                    ~ #(auto = 10):auto 
                    $ #(= B):int 
                9 #(integer):int 
            ~ #(auto = 2):auto