Problem: sort by first occurrence

Code: sort+by+first+occurrence/tails_1642141392

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 all by) 
        ;;@ (= allLines) 
        ~ (nosort) 
        (implicit arg = A) <--arg( A )