# code: http://golf.shinh.org/reveal.rb?Not+Pascal+Triangle/tails_1646627194&nbb
# target Nibbles version: 0.25
# commenter version: 0.1.2.181

< #(take):[[int]] 
    20 #(integer):int 
    | #(filter):[[int]] 
        `. #(iterate while uniq):[[int]] 
            ints #(_):[int] 
            \A 
            ! #(zip with):[int] 
                : #(append):[int] 
                    1 #(integer):int 
                    \ #(reverse):[int] 
                        A #($):[int] 
                \B 
                : #(append):[int] 
                    \ #(reverse):[int] 
                        A #(@):[int] 
                    0 #(integer):int 
                + #(zipop: add):null 
        #\C 
        #(implicit arg = C):[int]