Problem: Fill in the blanks

Code: Fill+in+the+blanks/tails_1645664315

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

+ (concat) 
    ! (zip with) 
        `% (split list (keep empties)) 
            > (drop) 
                + (add) 
                    , (length) 
                        @ (= fstLine) 
                    ~ (auto) 
                ;_ (= allInput) 
            "_" (string) 
        : (append) <--arg( A ) 
            _ (= fstLine) 
            "\n" (string) 
        : (zipop: cons)