Problem: number stairs

Code: number+stairs/tails_1723684389

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 with implicit range) 
    9 (integer) 
    : (append) <--arg( B A ) 
        , (range from 1) 
            $ (= B) 
        ~ (auto = [])