Problem: swap lowest two

Code: swap+lowest+two/whio_1725629284

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)

(implicit map) 
    _ (= ints) 
    / (foldr1) <--arg( B A ) 
        \ (reverse) 
            `^ (list xor) 
                < (take) 
                    2 (integer) 
                    `< (sort) 
                        ;@ (= ints) 
                (implicit arg = C) <--arg( C ) 
                (implicit arg = B) 
        (implicit arg = E) <--arg( E D )