#!/usr/bin/env perl6
use v6;


my @orig = (
    [ 'name'           ],
    [ 'year'           ],
    [ 'color', 'green' ],
    [ 'city'           ]
);

my @copy = @orig.deepmap( -> $c is copy { $c } );

@copy[1][1] = 1956;

say @copy;
say @orig;