Problem: stable partition

Code: stable+partition/darrenks_1640230125

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) 
    =~ (group by (also sorts)) 
        @ (= fstLine) 
        `$ (signum) <--arg( A ) 
            - (subtract) 
                $ (= A) 
                / (foldr1) 
                    _ (= fstLine) 
                    (implicit arg = C) <--arg( C B )