Quick, what does this print?

my %hash;
my @arr= qw( This is a test );
$hash{@arr}= 1;
$hash{@arr[0,1,2,3]}= 2;
$hash{@arr[0,1],@arr[2,3]}= 3;
print join $/, sort(keys %hash), "";
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        - tye (but my friends call me "Tye")