> L1 := [ 1, 2, 3 ];
L1 := [1, 2, 3]
> L2 := [ a, b, c ];
L2 := [a, b, c]
> [ op( L1 ), op( L2 ) ];
[1, 2, 3, a, b, c]
> [ L1[], L2[] ]; # equivalent, just different syntax