$HASH{2}, for example, is an array reference. For any array reference, you can get a copy of the array by surrounding the reference by
@{...}. You can get individual elements by putting
->[$index] after the reference. So..
my @things = @{ $HASH{2} }; ## @things is now a copy of @ARRAY2
my $foo = $HASH{2}->[1]; ## $foo is now $ARRAY2[1]
Also, when the
-> dereferencing operator is in between subscripts (as it is here, between a hash and array subscript), it is optional. So the 2nd example would usually be written as
$HASH{2}[1].
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