As gjb mentioned, you can copy with a dereference. Sometimes it's not necessary to copy, though, so you can always just use the reference as is. Here's some examples:

my $ref = $LoL[$n];
my @ary = @{$LoL[$n]};

$ref->[0] = "Foo";  # Modifies @LoL directly
$ary[0]   = "Foo";  # Only modifies @ary copy

foreach (@$ref) { ... }
foreach (@ary) { ... }
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