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  1. or download this
    my %hash;
my @array = (1..100);

# this will be ok
$hash{\@array} = 42;
  2. or download this
    my %hash;
my @array = (1..100);
...
# but this will issue an error, because \@array 
# cannot be used as a key which varies
$hash{\@array}{1} = 42;
  3. or download this
    use strict;

...
my @array = (1..100);
$hash{\@array} = {};
$hash{\@array}{1} = 42;