# code: http://golf.shinh.org/reveal.rb?this+problem+was+written+by+chat+gpt/tails_1697077255&nbb
# target Nibbles version: 1.00
# commenter version: 0.1.2.181

/ #(foldr1):[[chr]] 
    `' #(transpose):[[[chr]]] 
        . #(map):[[[chr]]] 
            , #(range from 1):[int] 
                * #(multiply):int 
                    fstInt #($):int 
                    fstInt #($):int 
            \A 
            `< #(sort):[[chr]] 
                | #(filter):[[chr]] 
                    ``p #(permutations):[[chr]] 
                        `p #(int to str):[chr] 
                            A #($):int 
                    \B 
                    == #(equal?):int 
                        \ #(reverse):[chr] 
                            B #($):[chr] 
                        \C 
                        `p #(int to str):[chr] 
                            `r #(read int):int 
                                B #(@):[chr] 
    #\E D 
    #(implicit arg = E):[[chr]]