Problem: comma format

Code: comma+format/plcc_1745219182

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)

\ (reverse) 
    * (join) 
        "," (string) 
        `/ (chunks of) 
            3 (integer) 
            \ (reverse) 
                @ (= fstLine)