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my @array=(Bob, Smith, 1234 Main St, Anytown, 20500);

my %hash=( firstname => Bob,
           lastname  => Smith,
           address   => 1234 Main St,
           town      => AnyTown,
           zip       => 20500);

print "His name is $array[0] $array[1]\n;

print "His name is $hash[firstname] $hash[lastname]\n;

$array(0)="Robert"
print "His name is $hash[firstname] $hash[lastname]\n; #wrong result